LOS ANGELES (CBSLA.com) — Police are reportedly questioning a man suspected of shooting a co-worker in Koreatown Thursday.

Paramedics responded shortly before 4 p.m. to a high-rise building at 3440 Wilshire Boulevard, near Normandie Avenue, according to LAPD Sgt. Dino Caldera. The structure houses a Bank of America branch on the ground floor and multiple businesses on the floors above.

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The suspect allegedly walked into Venture Commercial Realty, walked into his co-worker’s office and shot him.

The victim was taken to a hospital in critical condition.

The suspect surrendered to police as soon as they arrived, Caldera said.

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Authorities said they’re trying to determine what motivated the alleged attack.

Elise Powell, who goes to school inside the building, said she saw the suspect enter and exit the building. She described him as Korean and in his 40s.

“Once I did see him he had a totally different look on his face — of course, he was being arrested — but he had a totally different look on his face…very creepy, I want to say,” Powell said.

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Police briefly locked down the building and released employees soon after the suspected shooter was arrested.