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WASHINGTON (AP) — Nearly 300 armed American forces are being positioned in and around Iraq to help secure U.S. assets as President Barack Obama nears a decision on an array of options for combating fast-moving Islamic insurgents, including airstrikes or a contingent of special forces.

The U.S. and Iran also held an initial discussion on how the longtime foes might cooperate to ease the threat from the al-Qaida-linked militants that have swept through Iraq. Still, the White House ruled out the possibility that Washington and Tehran might coordinate military operations in Iraq.

Obama met with his national security team Monday evening to discuss options for stopping the militants known as the Islamic State of Iraq and the Levant. Officials said the president has made no final decisions on how aggressively the U.S. might get involved in Iraq, though the White House continued to emphasize that any military engagement remained contingent on the government in Baghdad making political reforms.

Still, there were unmistakable signs of Americans returning to a country from which the U.S. military fully withdrew more than two years ago. Obama notified Congress that up to 275 troops would be sent to Iraq to provide support and security for U.S. personnel and the American Embassy in Baghdad. The soldiers — 170 of which have already arrived in Iraq — were armed for combat, though Obama has insisted he does not intend for U.S. forces to be engaged in direct fighting.

About 100 additional forces are being put on standby, most likely in Kuwait, and could be used for airfield management, security and logistics support, officials said.

Separately, three U.S. officials said the White House was considering sending a contingent of special forces soldiers to Iraq. Their limited mission — which has not yet been approved — would focus on training and advising beleaguered Iraqi troops, many of whom have fled their posts across the nation's north and west as the al-Qaida-inspired insurgency has advanced in the worst threat to the country since American troops left in 2011.

Taken together, the developments suggest a willingness by Obama to send Americans into a collapsing security situation in order to quell the brutal fighting in Iraq before it morphs into outright war.

If the U.S. were to deploy an additional team of special forces, the mission almost certainly would be small. One U.S. official said it could be up to 100 special forces soldiers. It also could be authorized only as an advising and training mission — meaning the soldiers would work closely with Iraqi forces that are fighting the insurgency but would not officially be considered combat troops.

The White House would not confirm that special operations forces were under consideration. But spokeswoman Caitlin Hayden said that while Obama would not send troops back into combat, "He has asked his national security team to prepare a range of other options that could help support Iraqi security forces."

It's not clear how quickly the special forces could arrive in Iraq. It's also unknown whether they would remain in Baghdad or be sent to the nation's north, where the Sunni Muslim insurgency has captured large swaths of territory ringing Baghdad, the capital of the Shiite-led government.

The troops would fall under the authority of the U.S. ambassador in Baghdad and would not be authorized to engage in combat, another U.S. official said. Their mission would be "non-operational training" of both regular and counterterrorism units, which the military has in the past interpreted to mean training on military bases, the official said.

However, all U.S. troops are allowed to defend themselves in Iraq if they are under attack.

The three U.S. officials all spoke on condition of anonymity because they were not authorized to publicly discuss the plans by name.

Obama made the end of the war in Iraq one of his signature campaign issues, and has touted the U.S. military withdrawal in December 2011 as one of his top foreign policy successes. But he has been caught over the past week between Iraqi officials pleading for help — as well as Republicans blaming him for the loss of a decade's worth of gains in Iraq — and his anti-war Democratic political base, which is demanding that the U.S. stay out of the fight.

The crisis has sparked a rare alignment of interests between the U.S. and Iran, which wants to preserve Iraq's Shiite-dominated government. The U.S. and Iran are engaged in sensitive nuclear negotiations and used a round of talks Monday in Vienna, Austria, to hold a separate bilateral discussion on Iraq.

While the U.S. and Iran have similar short-term goals in Iraq, they have different long-term aims. The United States would like to see an inclusive, representative democracy take hold in Iraq, while predominantly Shiite Iran is more focused on protecting Iraq's Shiite population and bolstering its own position as a regional power against powerful Sunni Arab states in the Gulf.

It's unclear what type of cooperation the U.S. and Iran could undertake. Secretary of State John Kerry said in an interview with Yahoo! News that the U.S. would "not rule out anything that would be constructive," though U.S. officials quickly tamped down speculation that the discussion might include military coordination or consultation.

While the White House continues to review its options, Iran's military leaders are starting to step into the breach.

The commander of Iran's elite Quds Force, Gen. Ghasem Soleimani, was in Iraq on Monday and consulting with the government there on how to stave off insurgents' gains. Iraqi security officials said the U.S. government was notified in advance of the visit by Soleimani, whose forces are a secretive branch of Iran's Revolutionary Guard that in the past has organized Shiite militias to target U.S. troops in Iraq and, more recently, was involved in helping Syria's President Bashar Assad in his fight against Sunni rebels.

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Associated Press writers Matthew Lee, Lolita C. Baldor and Ken Dilanian contributed to this report.

NEW YORK (AP) — The Bitcoin digital currency system is in danger of losing its credibility as an independent payment system because of the growing power of a group that runs some of the computers behind it.

In recent weeks, a British-based "mining pool" called GHash has amassed nearly half of the Bitcoin computing power and has briefly gone over 50 percent. Miners operate the computers that keep track of bitcoins and create additional coins.

Miners pool their computing power to spread the financial risk of their operations. If GHash amasses more than half of the computing power devoted to Bitcoin, it could in theory control the flow of transactions, freeze people out of the network and keep all future bitcoins for itself.

Although GHash says it's committed to preserving Bitcoin as a trustable technology, the mere fact that one player can amass majority control could undermine trust in the currency, which is worth only what people are willing to pay for it.

"The entire premise of bitcoin relies on the fact that no single authority would control the majority of the mining power," said Ittay Eyal, a Cornell University researcher who studies bitcoin vulnerabilities.

The value of bitcoins has fallen 6 percent in a week to around $600 as the threat posed by GHash has become clearer, although the decline is within the range of normal fluctuations for the volatile currency.

Bitcoins allow people to send money over the Internet without going through banks. This means transaction costs are low, but it also means they're useful for illegal activities such as money laundering and drug sales. Bitcoins have also become a target of speculators betting on a continued run-up in the currency. Its value has grown a hundredfold over two years.

From a technical standpoint, bitcoins are sequences of numbers, painstakingly produced by computers churning through millions of calculations. Bitcoin transactions are recorded in a virtual public ledger, known as the blockchain. Miners are in charge of maintaining the blockchain. As their computers perform the calculations to do that, the process rewards them with newly minted bitcoins.

A single mining computer might take years to produce a single block of coins, and there's no way to know when that might happen. In pools, miners divide the bitcoins they create among themselves in proportion to the work done, providing with them with a steadier stream of income. The pools aren't created to threaten the trust placed in bitcoin; it's a side effect of the pool's growth.

GHash is controlled by a British company, CEX.IO Ltd. The company said in a statement Monday that it wants to protect Bitcoin, but it doesn't want to turn away people from the pool or impose other temporary solutions to back away from the 50 percent threshold.

GHash said it's arranging a "round table" meeting of key players in the Bitcoin system in July to "with the aim of discussing and negotiating collectively ways to address the decentralisation of mining as an industry."

Eyal said the problem needs to be fixed in "a very drastic fashion" to reduce the incentive to create pools. That will probably with an update to the software the underlies the system, he said.

RIO DE JANEIRO (AP) — Germany was supposed to be a team that would melt in Brazil's tropics.

Instead it was Portugal that felt the heat on Monday in a Group G match in Salvador. Thomas Mueller scored a hat trick, Portugal played with 10 men after a red card in the 37th minute, and German President Angela Merkel wore a big smile following a 4-0 victory in Brazil's northeast.

The World Cup continued to deliver lots of goals in the first 12 games — 41.

In the 13th game of the tournament, Nigeria and Iran played a scoreless draw — the first draw of this World Cup. Argentina defeated Bosnia 2-1 on Sunday in the other Group F match, and both will feel confident after watching Nigeria and Iran fail to produce.

CASABLANCA, Morocco (AP) — Multinational energy company Eaton has broken ground on a new $12 million electronics plant in Morocco that could signal increased foreign investment for this North African country.

Bulldozers broke ground Monday on the site near Casablanca's airport. The factory will export circuit breakers and telecommunications equipment around the region.

Industry Minister Hafid Alamy said it was a part of Morocco's strategy to attract foreign investment and create manufacturing clusters.

The president of Eaton's electrical sector, Frank Campbell, told The Associated Press that Morocco was chosen for its proximity to European and African markets and stability during the Arab Spring pro-democracy uprisings. He suggested that future expansion could follow if the investment goes well.

Canadian plane maker Bombardier in September announced plans for a $200 million factory in the same area.

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