ZHENGZHOU - A suspect has been arrested after three female students were killed and another was injured in a college dormitory early Tuesday in Central China's Henan province, police said.

The male suspect, surnamed Zhang and born in 1991, broke into the dormitory of Henan Polytechnic College at 5:30 am, and killed three of the four students in the room, injuring the other one, police said.

Police caught Zhang at 11:50 am.

Zhang was not a student of the college. He got to know one of the students in the room over the Internet and planned an attack after a dispute, police said.