UNITED NATIONS -- UN Secretary-General Ban Ki-moon on Sunday strongly condemned a deadly terrorist attack on a tourist bus in southern Sinai, Egypt, calling for the perpetrators to be brought to justice.??

A bus in the southern Sinai town of Taba was struck by a terrorist attack Sunday, which reportedly killed four people, including three tourists from the Republic of Korea (ROK), and injured many others.

In a statement issued by Ban's spokesman, the secretary-general "conveys his condolences to the families of the victims and to the governments of Egypt and the Republic of Korea," the statement said. Ban also "calls for the perpetrators to be brought to justice."

A bomb exploded in the front part of the bus carrying ROK sightseers near Taba border crossing with Israel in southern Sinai. Three tourists and an Egyptian driver were killed in the attack, reports said.

It was the first attack on tourists since the ouster of President Mohamed Morsi by the Egyptian army in July sparked civil unrest and a spate of attacks across the country that have mainly targeted security forces.