MANHATTAN, Kan. (AP) — Kansas State University returned to normal operations after a nearly four-hour lockdown prompted by reports that a gunman might be on campus. The lockdown began after police received several reports early Friday of an armed robbery involving several people. Riley County police said in a news release that officers got into a foot chase with a possible suspect in the robberies, who was last seen running to the campus. That prompted alerts urging everyone on campus to stay indoors and those off campus to stay away. Student dormitories were locked down. After a building-by-building search, the lockdown was lifted at about 9:30 am. The possible gunman was not found. Manhattan Christian College also was closed until 9:30 am because of the search on the Kansas State campus.