Va. Tech lockdown recalls 2007 shooting spree

By ZINIE CHEN SAMPSON | August 5, 2011 | 3:15 AM EDT

Police escort summer camp students from Dietrick Hall dining facility after Virginia Tech was locked down for several hours Thursday, Aug. 4, 2011, in Blacksburg, VA., when three children attending the summer camp said they saw a man holding what looked like a gun on the campus where a 2007 massacre left 33 people dead. The university issued an alert on its website at 9:37 a.m. telling students and employees to stay inside and lock their doors. (AP Photo/Don Petersen)

BLACKSBURG, Va. (AP) — Memories of the worst school shooting in U.S. history at Virginia Tech came flooding back when the campus locked down after reports of a man with a gun.

The university on Thursday issued the longest, most extensive lockdown and search on campus since the 2007 massacre. It came after three teenage girls attending a summer camp on campus reported to university police that they saw a man with a possible gun as they walked to the dining hall.

The school lifted the lockdown more than five hours later after a search for such a man was unsuccessful and police had no real leads.

University spokesman Larry Hincker says all alerting systems worked without a hitch and issuing such a warning was necessary.