Two suicide bombers targeted Pakistan's main army camp in a key tribal district on the Afghan border on Wednesday, killing two soldiers and damaging a field hospital, officials said.
A military official said two suicide bombers drove a double cabin vehicle to the gate of the camp, seven kilometres (four miles) northwest of Wana, the main town of South Waziristan.
"Two suicide bombers in an explosive-laden car tried to target Zarai Noor Camp. The soldiers spotted the car 100 metres from the camp. Both bombers were blown up in the car and two soldiers were also martyred," the official said.
The district administration chief said the car smashed into a barrier at the camp.
"Two suicide bombers hit the barrier with their vehicle at the main gate of the camp. The gate and a small hospital inside the camp were damaged in the attack," Shahid Ullah told AFP.
South Waziristan is a stronghold of Pakistani warlord Mullah Nazir, who sends men into Afghanistan to fight US and NATO troops. He was wounded in a suicide attack in Wana on November 29, according to officials.