US drone kills 4 Qaeda suspects in Yemen: tribal source

SANAA: A US drone strike killed four suspected Al-Qaeda militants in Yemen's eastern Marib province early Tuesday, a tribal source told, amid heightened security against a possible attack by the jihadist network.

The raid targeted their vehicle "and turned it into a ball of fire, immediately killing the four militants, all of whom are Yemeni," the source said.

About two dozen US diplomatic posts have been shuttered across the Middle East since Sunday after Washington said electronic intercepts of high-ranking Al-Qaeda operatives signalled a major attack was imminent.