Police have identified the gunman in UCLA murder-suicide

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UCLA shooting

REUTERS/Patrick T. Fallon

A Los Angeles Metro Police officer stands watch on the University of California, Los Angeles (UCLA) campus after it was placed on lockdown following reports of a shooter in Los Angeles, California June 1, 2016.

The gunman who police say killed a University of California, Los Angeles engineering professor before killing himself has been identified by the Los Angeles Police Department as Mainak Sarkar, NBC LA has reported.

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No additional details have been released about Sarkar, who allegedly shot William Klug, 39, using a 9mm semi-automatic pistol inside UCLA's Engineering IV building on Wednesday morning.

Klug, a father of two, taught mechanical and aerospace engineering at the school. UCLA is in the midst of its final exams season, and CBS News affiliate KNX cited a law enforcement source who said the shooting may have stemmed from an issue concerning grades.

Classes resumed at UCLA on Thursday - except for inside the school's Engineering IV building, which is still a crime scene - after the school was on lockdown for most of the day on Wednesday. Hundreds of police officers responded to reports of a shooting at around 10 a.m. local time Wednesday morning. The FBI and the ATF were also at the scene.

William Klug UCLA

Via ABC7

UCLA Professor William Klug

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"Our hearts are heavy this evening as our campus family mourns the sudden and tragic deaths of two people on our campus earlier today," UCLA's chancellor, Gene Block, said in a statement on Wednesday.

Authorities will be "reviewing the locks on the doors among other measures ... to ensure our campus is as safe as possible," Scott Waugh, UCLA's executive vice chancellor and provos said Wednesday.

Waugh was referencing the measures students and faculty apparently took in order to secure the doors while the campus was on lockdown.

Photos on social media showed people using belts, desks, chairs, and computer equipment to secure classroom doors that reportedly were not equipped with locks.

"On any given day, there are between 60 and 70,000 people on campus," Waugh said, citing the need to assess the school's overall safety measures.

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