At least four minor students were killed and eight others seriously injured as the roof of a religious seminary (Madressah) collapsed in a village of Pakistan's Punjab province in the wee hours of Saturday, police said. The incident took place in Chak No. 447/EB Luddan Road in the Burewala area of southern Punjab, some 500 kilometers from Islamabad. The roof caved in due to torrential rains, police said.