Amid concerns over a militant group’s advancement toward the Iraqi capital, US President Barack Obama Monday notified Congress that up to about 275 US military personnel will be in Iraq to provide support and security for US personnel and the American embassy in Baghdad.

Obama said in a letter to Congressional leaders that the force, which began deploying Sunday, has been sent “for the purpose of protecting US citizens and property, if necessary, and is equipped for combat,” Xinhua reported.

“This force will remain in Iraq until the security situation becomes such that it is no longer needed,” Obama wrote.