Shootings & Shooting Scares

Police handcuff Cody Cousins, 23, after a deadly shooting at Purdue University in West Lafayette, Ind. Officials said Wednesday that the electrical engineering building where authorities say Cousins shot 21-year-old Andrew Boldt was reopened.  (Carl Abernathy / Associated Press)

Kevin Luse of the Purdue University Fire Department collects police tape at the electrical engineering building a day after a shooting took place on campus Tuesday.  (John Terhune / Associated Press)

Police officers approach Gould Hall at the University of Oklahoma in Norman, Okla., as the area was closed following reports of gunfire Wednesday. The campus was locked down after a faculty member reported hearing gunshots, but the school’s president said it appeared the incident was a false alarm perhaps tied to construction equipment being used nearby.   (Sue Ogrocki / Associated Press)

A student leaves Columbine High School after a lockout was lifted Thursday. The school, where a shooting left 13 people dead in 1999, went on high security alert this week after receiving a series of threatening phone calls, law enforcement said.  (Ed Andrieski / Associated Press)