The attack in Ramadi, the capital of mainly Sunni Anbar province and a former al-Qaeda stronghold, raised fears of renewed sectarian violence.
The bus, carrying 45 Lebanese pilgrims, was heading to Baghdad from Syria, the source said.
"A roadside bomb exploded near a bus carrying Lebanese pilgrims coming to Iraq, probably to visit the sacred shrines in Iraq," said the source, speaking on condition of anonymity. Read More