Pakistani Prime Minister Shaukat Aziz Sunday denied that any military operation has been launched in northern Sawat valley amid reports that the heavy exchange of fire has claimed more lives in the scenic valley. "On the request of provincial government for help in maintenance of law and order, Frontier Constabulary and Frontier Corps have been involved", he said while talking to newsmen in Southern Karachi city. "We are trying to restore peace in Swat", said the Prime Minister, adding that the situation will soon be under control because the government does not want disruption in law and order and loss of innocent lives.His comments came as the military spokesman Waheed Arshad confirmed that on Sunday at least 10 militants were killed in clashes with security forces. Security sources told KUNA that in Sunday's gunbattle between supporters of local militant commander Maulana Fazlullah and security forces at least 15 including security personnel were killed and many were wounded. Forces launched offensive against Maulana and his supporters on Friday a day after a suicide bomber blew himself up near an army truck, carrying huge cache of ammunition. The explosion killed about 39 security personnel and wounded several civilians.