Bus blast kills at least 4 on Egypt's border with Israel

Israeli soldiers are on high alert after a bus blast kills at least four on the Egyptian side of the border.

Officials said the attack killed three Koreans and the Egyptian driver.

The bus was heading from a popular tourist destination in the south Sinai to the Taba crossing.

Nobody claimed responsibility for the blast, but al Qaeda-inspired Islamist militants have carried out several attacks there in recent months.

The incident remains under investigation.