PESHAWAR (Agencies) - Mortars fired from Afghanistan struck a house in South Waziristan on Saturday, killing two people including a girl and wounded two others, a private TV channel reported. The house struck in the attack was situated in South Waziristans Angoor Adda area. Subsequently, Pakistan lodged a protest with the Afghan National Army and the International Security Assistance Force. Meanwhile, Six militants were killed and five others injured in a search operation of security forces in Sholaam area of tehsil Sarokai, South Waziristan Agency said sources in security forces. According to details security forces launched search operation in Sholaam area on Razmak Road 40-kilometer of north from Wana. During the operation six militants were killed and five others injured. Meanwhile, twelve mortar shells were fired from Afghanistan into tehsil Birmal of South Waziristan. One of the shells hit the house of a local tribal elder Afsar Khan Wazir resulting in the killing of a seven year child while two other were sustained serious injuries. The injured were rushed to a local private clinic and their conditions were stated to be critical. On contact the political administration and security forces confirmed both incidents.