A bomb tore through a bus carrying sightseers near an Egyptian resort town bordering Israel on Sunday, killing at least three tourists and wounding 14, police said.
The bus was carrying 33 tourists near the south Sinai resort town of Taba when it was hit by the blast, police officials said.
A spokesman for the Israel Airports Authority, which is responsible for border security, told AFP that the Taba crossing had been closed in the wake of the blast.
No one immediately claimed responsibility for the attack.
Militants in the restive peninsula have waged a deadly insurgency against the military and police since the overthrow of Islamist president Mohamed Morsi in July.
Scores of policemen and soldiers have been killed in bombings in Sinai and the Nile Delta, but Sunday's blast is the first targeting tourists since Morsi was deposed.
The unrest has severely hit tourism, a vital earner in Egypt, which has been targeted sporadically by militants over the past two decades.
Between 2004 and 2006, scores of Egyptians and foreign tourists were killed in a spate of bombings in resorts in south Sinai.
In 1997, Islamist militants massacred dozens of tourists in a pharaonic temple in the southern city of Luxor.