Shooting at USC Halloween party

Students and people who attended a party on the campus of USC are allowed to leave after the USC campus was in lockdown after four people were shot including one in critical condition during a Halloween party at the Tutor Campus Center on Nov. 1, 2012, in Los Angeles, Calif. The university issued an alert to students and staff that the police were investigating an incident and requested the campus be shut down while encouraging others to stay away from the area to further notice.

USC's Department of Public Safety officer secure the crime scene after four people were shot including one in critical condition during a Halloween party at the Tutor Campus Center on Nov. 1, 2012, in Los Angeles, Calif.

A USC Department of Public Safety officers question suspects after four people were shot including one in critical condition during a Halloween party at the Tutor Campus Center on Nov. 1, 2012, in Los Angeles, Calif.

USC's Department of Public Safety officer secure the crime scene after four people were shot including one in critical condition during a Halloween party at the Tutor Campus Center on Nov. 1, 2012, in Los Angeles, Calif.

Los Angeles Police Department officers and USC Department of Public Safety officer gather at the command post after four people were shot including one in critical condition during a Halloween party at the Tutor Campus Center on Nov. 1, 2012, in Los Angeles, Calif.

Students and people who attended a party on the campus of USC are allowed to leave after the USC campus was in lockdown after four people were shot including one in critical condition during a Halloween party at the Tutor Campus Center on Nov. 1, 2012, in Los Angeles, Calif.

Los Angeles Police Department officers and USC Department of Public Safety officer gather at the command post after four people were shot including one in critical condition during a Halloween party at the Tutor Campus Center on Nov. 1, 2012, in Los Angeles, Calif.

Students and people who attended a party on the campus of USC are allowed to leave after the USC campus was in lockdown after four people were shot including one in critical condition during a Halloween party at the Tutor Campus Center on Nov. 1, 2012, in Los Angeles, Calif.

A USC Department of Public Safety officer removes the handcuffs from a suspect after four people were shot including one in critical condition during a Halloween party at the Tutor Campus Center on Nov. 1, 2012, in Los Angeles, Calif.

USC's Department of Public Safety officer secure the crime scene after four people were shot including one in critical condition during a Halloween party at the Tutor Campus Center on Nov. 1, 2012, in Los Angeles, Calif.

Students and people who attended a party on the campus of USC are allowed to leave after the USC campus was in lockdown after four people were shot including one in critical condition during a Halloween party at the Tutor Campus Center on Nov. 1, 2012, in Los Angeles, Calif.

USC's Department of Public Safety officer secure the crime scene after four people were shot including one in critical condition during a Halloween party at the Tutor Campus Center on Nov. 1, 2012, in Los Angeles, Calif.

A USC Department of Public Safety officer removes the handcuffs from a suspect after four people were shot including one in critical condition during a Halloween party at the Tutor Campus Center on Nov. 1, 2012, in Los Angeles, Calif.