A platoon of US Marines from with the fleet anti-terrorism security team have been sent to Yemen to bolster security at the embassy and are now on the ground in Sanaa, the Pentagon said on Friday.

Elsewhere in the region, protesters against a film denigrating the Prophet Mohammad breached embassy walls in Tunisia and Sudan. Footage on Al Jazeera showed smoke coming from the area of the US Embassy in Tunis and protesters breaching the walls of the mission in Khartoum.

"This is partly a response to events over the past two days at our embassy in Yemen but it's also in part a precautionary measure," Pentagon spokesman George Little told reporters.

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