The United States could cooperate with its traditional foe Iran to stop Sunni militants -- known as the Islamic State of Iraq and the Levant, -- from continuing their rampage through Iraq.
In an interview with Yahoo News on Monday, Secretary of State John Kerry said that, while Washington is not in active discussions with Tehran, it will not rule out anything constructive in providing stability to the region.
Another U.S. official said the two sides could discuss the situation in Iraq on the sidelines of nuclear talks scheduled for Wednesday in Vienna.
If it were to happen, cooperation between Washington and Tehran to contain the Iraqi crisis, would mark the first time in more than a decade for the two countries to jointly undertake a common security purpose.
Iran is a strong backer of the Shiite government in Iraq and has signaled a readiness to cooperate with the U.S. to contain the crisis.
Pentagon, however, made it clear that it will not engage with Iran on military activities in Iraq.
As the situation spirals out of control, Kerry added that air strikes are an option available to Washington, but no detailed plans on how to coordinate them have been drawn up yet.
Meanwhile, President Obama on Monday has notified Congress that 275 U.S. troops will be deployed to Iraq to provide support and security for U.S. personnel and the American Embassy in Baghdad.
The troops are combat ready and will remain in Iraq until the security situation is brought under control.
About 160 troops are already in the country, including 50 Marines and more than 100 Army soldiers.
Radical militants from the Islamic State of Iraq and the Levant have seized large parts of northern Iraq over the last several days, threatening to dismember Iraq and unleash all out sectarian warfare.
Kim Hyun-bin, Arirang News.