A roadside explosion in the Gaza Strip on Thursday blew out the windows of a jeep travelling in a Red Cross convoy, but no one was injured in the blast, the organisation said.
Residents living nearby said they believed the explosion was a roadside bomb. A spokesman for the Hamas group which runs the Gaza Strip suggested the blast was caused by an unexploded Israeli shell.
"The convoy was on its way to the Erez crossing, when an explosion took place on the side of the road," Eyad Naser, a spokesman for the International Committee of the Red Cross (ICRC) in Gaza said.
"As a result of the powerful explosion the windows of one jeep were smashed, but the cars continued to Erez and they have left Gaza," he added.
The Red Cross convoy leaves the Gaza Strip regularly every Thursday via the Erez route.
Attacks on foreigners have become rare in Gaza in the past two years.
But newly established radical Islamist groups who share the ideology of al Qaeda have mounted bombing attacks on places in Gaza such as Internet cafes and Christian schools and property.
Such groups seek to defy Hamas rule in Gaza and criticise its leaders for not implementing strict Islamic law.