The international Red Cross said Sunday it was halting its service of escorting Palestinian ambulances in the Gaza Strip.
Red Cross spokesman Iyad Nasr said the decision was made after one of its ambulances came under fire.
He said the incident occurred on Saturday during a three-hour lull declared by Israel to allow aid groups to do their work in the besieged area.
Nasr says his organization was still investigating the source of the fire.
Israel has in the past accused Hamas of hiding gunmen inside ambulances.