KHAR, (Reuters) – A suicide bomber blew himself up in a small restaurant in Pakistan’s Bajaur tribal region on the Afghan border on Saturday, killing five civilians and wounding 10, officials said.

Pakistan has seen a surge in militant violence since al Qaeda chief Osama bin Laden was killed in a U.S. raid in a northern Pakistani town on May 2. Pakistani Taliban militants allied with al Qaeda have vowed to avenge bin Laden’s killing.

The latest blast occurred in Salarza, about 15 km (10 miles) north of region’s main town of Khar.

“According to witnesses and evidence at the spot, it was a suicide attack. The bomber walked in the restaurant and set off explosives strapped to his body,” Saad Mohammad, a government official, told Reuters.

He said five people were killed. Residents have formed a tribal force to fight Taliban militants in the area that borders Afghanistan.

A suicide car bomber killed 27 people in an attack outside a police station in the northwestern city of Hangu on Thursday.

The Taliban on Sunday attacked a heavily guarded naval base in the southern city of Karachi. Ten military personnel were killed and two aircraft destroyed.