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The US Embassy in Baghdad has issued a security alert and STEP alert to Americans in Iraq. The alert was reportedly issued around the same time as similar security alerts sent by the US Embassies in Oman and Israel.

An Iraqi security source told CNN on Saturday (local time) that a "huge explosion" took place at a military base belonging to Iraq's Iranian-backed Popular Mobilization Forces (PMF) in Babylon Governorate south of Baghdad.

The explosions took place at an ammunition depot at a PMF military base, the source said, but didn't provide further details or elaborate on a cause.