Egyptian police say a suicide bomber was likely behind a deadly blast on a tourist bus that killed three South Koreans and their Egyptian driver.
Officials say the bomber boarded the bus and detonated explosives as it waited near the Taba crossing on Egypt's border with Israel. The officials say some of the tourists had disembarked when the bomber got on board.
The bus was carrying 33 South Koreans tourists at the time of the attack.
The tourists were members of a church group and were travelling from St. Catherine's Monastery, in central Sinai, to Israel, when the blast occurred.