A US drone struck a militant compound in the restive South Waziristan tribal region in northwest Pakistan on Sunday, killing at least four terrorists and injuring five others in the second such attack in as many days.
The unmanned spy planes fired at least four missiles at the militant compound in Shaktoi Angad area of South Waziristan, which is inhabited by Mehsud tribesmen, TV news channels reported.
Local tribesmen began rescue operations soon after the attack, which left four militants dead and five others injured.
The group to which the dead militants belonged could not immediately be ascertained.
Drones continued flying over area after the strike, local residents said.
The attack came a day after at least 18 militants, including foreign fighters, were killed and nine others injured in a drone strike on a terrorist compound in Angoor Adda area of South Waziristan that borders Afghanistan.
The drone strikes coincided with the visit of US Joint Chief of Staff Chairman Admiral Mike Mullen to Pakistan for discussions with the Pakistani military's top brass.
The top most American commander has expressed US worries over Taliban and al-Qaeda sanctuaries in Pakistan and urged the Pakistan Army to strike against groups like the Haqqani network.
There was no immediate confirmation if any high-value terrorist target was among the casualties in the drone attacks. US drones normally target key al-Qaeda and Taliban commanders.