File image - An Afghan policeman stands guard at the scene of a bomb attack in Kandahar, south of Kabul, Afghanistan.

Islamabad - At least six alleged militants were killed Friday when some 30 mortars fired from Afghanistan hit Pakistan's remote tribal region in the north-west, security officials said.

The mortars exploded in the Angoor Adda area of South Waziristan, one of seven districts where Taliban militants have their strongholds.

A security official confirmed the attack and said that those killed were Taliban militants associated with the Maulvi Nazir group.

The groups' founding leader, Maulvi Nazir, was killed in a US drone attack early last month near Wana, the main town in South Waziristan.

The groups has a peace agreement with the Pakistani army. It has been blamed for several attacks on US and other targets in Afghanistan. - Sapa-dpa