Police trying to search a suspected hide-out for Islamic extremists in southern Serbia came under attack and killed one of the suspects, authorities said Friday. Officers were attempting to search the suspected safe house of a leader of a local group of Muslims following the extreme Wahhabi branch of Sunni Islam. A hand grenade was thrown at the officers, injuring one of them. Police said they responded with machine-gun fire, killing one of the men inside, injuring another and arresting a third.