GARISSA, Kenya (AP) — Al-Shabab gunmen rampaged through a university in northeastern Kenya at dawn Thursday, killing 147 people in the group’s deadliest attack in the East African country. Four militants were slain by security forces to end the siege just after dusk. The masked attackers — strapped with explosives and armed with AK-47s — singled out non-Muslim students at Garissa University College and then gunned them down without mercy, survivors said. Others ran for their lives with bullets whistling through the air. The men took dozens of hostages in a dormitory for several hours as they battled troops and police before the operation was ended after about 13 hours, witnesses said.