Pakistani troops backed by gunship helicopters today destroyed three hideouts, killing 12 militants in the restive northwesten Orakzai tribal region. According to official sources, ground forces conducted operations in Sanghra, Saam and Nakhtaro Ghar areas of Orakzai agency.Security officials have claimed that about 300 militants have been killed since an operation was launched in Orakzai Agency to flush out pro-Taliban militants. About a dozen security personnel have also died in the fighting.