USC Shooting: Brandon Spencer, 19, arrested in connection with Halloween campus shooting

(CBS) - Police arrested a 19-year-old man early Thursday in connection with the shooting attack that wounded four people at a Halloween party on the University of Southern California campus.

Pictures: Shooting at USC Halloween Party

The Los Angeles Times reported that Brandon Spencer and another suspect were arrested just after midnight on Thursday morning. It is unclear whether the second person is still being held.

About 100 people gathered for a party hosted by a student organization late Wednesday, Oct. 31, outside the Ronald Tutor Campus Center.

Authorities said the shooting stemmed from an argument between two people who were not tied to the school. The argument led to one of them pulling out a gun and shooting another person, said police. That victim was hit several times but is expected to survive. Three other bystanders, none of them students, also suffered non-life-threatening wounds.

USC President C.L. Max Nikias said in a statement that the school was "carefully assessing and reviewing all of the university's policies regarding visitors and events held on campus" but added that the risk of such violence on campus was very low. He later told the LA Times in an email that he would announce policy changes next week.

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Nov. 1, 2012 - USC Shooting: Two suspects in custody, four people wounded at campus Halloween party, police say