PESHAWAR (AFP/Reuters) - Troops backed by fighter jets killed more than 30 suspected Taliban militants and arrested another 10 around the Swat valley and northwest tribal belt on the Afghan border, officials said Wednesday. The high number of casualties, which are impossible to confirm, is the latest in a surge of deadly clashes reported since commanders said they had effectively defeated Taliban opposition in parts of the northwest. The military announced Wednesday that 16 terrorists were killed and three terror training centres destroyed over the last 24 hours in Dir, just to the north of Swat where the military offensive was launched in late April. In Swat and Buner, where the government has bussed back thousands of the 1.9 million civilians who were displaced by the fighting, the military said 11 terrorists were killed and two soldiers wounded. Pakistan says more than 1,800 militants and 166 security personnel have been killed, but the death tolls are impossible to verify independently. Late Tuesday, jets pounded suspected bases of wanted Taliban warlord Baitullah Mehsud, killing four of his militants in South Waziristan, an official said. The aircraft bombed a militant base and Taliban compound in the Sarwakai area of South Waziristan. Both were destroyed and a total of four militants were killed, a military official said, requesting anonymity, adding that the dead men belonged to Mehsuds Tehreek-e-Taliban group. A government official confirmed the raids in Sarwakai, controlled by feared Taliban chief Mehsud, but gave no casualty figures. Although commanders say air strikes in South Waziristan are in preparation for a ground offensive against Mehsud, there has been little sign of an imminent new front on terrain well suited to guerrilla warfare. In neighbouring North Waziristan, a mortar attack aimed at a paramilitary base killed one soldier and wounded five others, officials said.