Five US soldiers were killed on Saturday in the western Iraqi city of Ramadi, the US military said on Sunday.

The five were killed when a roadside bomb hit their vehicle in the city, some 100 km west of Baghdad, as Iraqis voted on a draft constitution in a referendum, the military said.

The military didn't provide further details on the deaths, which have brought to at least 1,970 the number of US soldiers killed since the US-led war in Iraqi in 2003.

Ramadi, mainly Sunni, is located in the volatile Anbar province in the west.

Source: Xinhua