On Sunday, the UN chief denounced the attack on a tourist bus in the Sinai town of Taba in a statement issued following the incident.

The attack reportedly killed several people, including three South Korean tourists.

“He (the UN chief) conveys his condolences to the families of the victims and to the Governments of Egypt and the Republic of Korea. He calls for the perpetrators to be brought to justice,” the statement said.

Reports said that at least 30 people were injured in the attack and rushed to a nearby hospital to receive necessary treatment.

"There were body parts and corpses. I saw the corpse of a man who appeared to be Korean, with a leg missing," said a doctor who runs a clinic in the troubled region.

Sinai has been volatile recently. Militants have stepped up attacks against security forces and other targets over the past few months.

On February 3, three civilians were injured in an attack on a bus carrying Egyptian soldiers in the town of Rafah, which borders the Gaza Strip.

On August 19, 2013, militants ambushed a police convoy in the northern region of Sinai. At least 25 policemen were killed in the attack. It was one of the deadliest attacks on security forces in decades.

Egypt has been experiencing unrelenting violence since last July when the army toppled the country’s first democratically-elected President Mohamed Morsi, suspended the constitution, and dissolved the parliament. It also appointed the head of the Supreme Constitutional Court Adly Mahmoud Mansour as the new interim president.