MIRANSHAH: A second US drone strike on Thursday killed at least four militants in Pakistan's troubled tribal area along the Afghan border, security officials said.

The unmanned aircraft fired four missiles, hitting a house in Hisokhel village, some 30 kilometres (18 miles) east of Miranshah, the main town of the North Waziristan tribal district, security officials told AFP.

The strike came hours after another unmanned aircraft attack killed four militants including the brother of a Pakistani Taliban commander in Azam Warsak, 20 kilometres west of Wana, the main town of the neighbouring South Waziristan tribal district.

“A US drone fired four missiles. At least four militants were killed,” a security official said of the second attack.

The identities of the militants killed in the second attack were yet not immediately known, he said.Another security official official confirmed the attack and casualties.