Pakistani authorities enforced a curfew for a second day in the troubled northwestern Swat valley, where troops pounded militant hideouts with artillery and mortars, officials said. Pakistan's military is battling extremists loyal to radical cleric Maulana Fazlullah waging a violent campaign to introduce Islamic Sharia law in a valley that once attracted Western holidaymakers to its snow-capped peaks. "A curfew has been imposed... for an indefinite period," said a local government statement, naming a string of hamlets that are known troublespots. "Anybody violating the curfew will be shot on sight. No vehicle is allowed to move in these areas," it said. The curfew was enforced Sunday after Fazlullah -- in a speech on his personal radio station -- released the names of 40 people, including provincial ministers, MPs and local government officials, "wanted" by the Taliban. "These people encouraged military operations in the area and are responsible for the killings of Taliban and civilians," the cleric said, vowing to try them in Taliban courts. The regional government on Monday downplayed the threat. "The government will not bow before these miscreants," provincial information minister Mian Iftikhar Hussain said. The military said troops assaulted militant hideouts in Chaharbagh and Manglore, small rural towns, with artillery and mortars.