A shooting at the University of Central Arkansas' left two students dead and a third wounded, authorities said early Monday. UCA police spokeswoman Lt. Rhonda Swindle said the gunshots were first reported at 9:19 p.m. An officer heard the shooting, which occurred near a male dormitory and behind the campus police station, and arrived on the scene in less than a minute, she said. Witnesses described hearing as many as five gunshots ring out. One man fell to the sidewalk along the narrow alley between the dormitory and a fine arts center and died. Swindle said the two others rushed into the dorm, where they were found by paramedics. One man died at a local hospital, while another who wasn't a student was treated and released, Swindle said. Swindle had no immediate explanation for the shooting, though she said police questioned one "person of interest" into the early morning hours. She said detectives believed four people were involved in the attack, though no arrest or search warrants had been issued. "We have really good leads we're following up on right now and we feel the campus is safe," Swindle said. However, the campus remained under guard Monday morning, with police cruisers circling its quiet streets and officers roaming the grounds in flak jackets and blue jeans. Faculty and students received phone calls and e-mails through an automated system at 9:38 p.m. warning them of the shooting and encouraging them to stay inside behind locked doors. Swindle said video captured by surveillance cameras also installed at the campus after the massacre would be examined. Sunday's shooting is the second at an Arkansas college this year. On Feb. 27, a man was shot and wounded at the University of Arkansas at Little Rock. Two suspects were eventually charged.