WASHINGTON, Oct. 22 (Xinhua) -- A U.S. university was shut down on Wednesday following reports saying that gun shots were fired during altercations, said a TV report.

    According to CNN, police has put the Western Kentucky University under lockdown after receiving reports of altercations involving weapons at the south campus building and then a largest residence hall.

    Robbin Taylor, the university's vice president for public affairs, told the TV that, however, no witness has confirmed the reports that shots were fired in either location.

    As a precaution, the university has activated its emergency warning system in the afternoon, and advised through text alert all students and employees to remain indoors.

    Local media reports said that police are searching for four people in black with guns, who were involved in the altercations.