Peshawar - A roadside bomb killed five anti-Taliban fighters and wounded two others in South Waziristan Agency on Thursday evening, officials said.

The evening incident took place in South Waziristan's Spinkai area near the Afghan border when a group of anti-Taliban fighters were returning from a function. According to two intelligence officials, their vehicle was attacked using a remotely detonated bomb . The officials said the group was part of a volunteers' militia helping the military in operations against militants.

The intelligence officials spoke on condition of anonymity because they were not authorised to speak to the media. They said the group's leader, Wali Jan, had earlier survived a suicide attack but continued to play a role in fighting Taliban militants. They said the two wounded men were moved to a military hospital. Umar Arshad, an assistant administrator in South Waziristan, confirmed the intelligence officials' account.

A faction of Pakistani Taliban militants, known as the Sajna group of Tehrik-e-Taliban Pakistan, claimed responsibility for the bomb attack.

Pakistan's military conducted massive operation against militants in South Waziristan in 2009 and continue to try and clear the vast tribal region but militants still show the capability to cross from the Afghan border and plant bombs along the roadside, attacking security forces or their supporters.

Pakistan is building a fence along the boundary to halt the cross-border movement of militants but Afghanistan, which does not recognise the Durand Line as an international border, has objected to the fence as a land grab by Islamabad.

Also on Thursday, the banned Pakistani militant group Lashker-e-Jhangvi claimed responsibility for an attack on a Shiite mosque in the Pakistani capital a day earlier that killed an intelligence official and wounded four other worshippers.