Two people were killed Friday afternoon after a man opened fire in San Francisco's South Market neighborhood, NBC reports.

Police officers responded to a "shots fired" call at a gift center around 2:30 p.m. in the area of 7th and Brannan streets. Officers discovered two victims in the lobby of 888 Brannan, according to KTVU. One other man was injured.

Albie Esparza, a spokesman for the San Francisco Police Department, told NBC that officers encountered "a bloody subject who immediately began firing at the officers." The officers were responding to "multiple shots [that were] fired prior to SFPD arrival."

The suspect fired on officers, ran around the corner, and fired on others before finally surrendering.

Police Chief Greg Suhr told reporters he believes the suspect may have run out of ammunition. He did not know of any possible motive, but did say "we have reason to believe this isn't the first time the suspect has been in the building."

The husband of a woman working in the Gift Center and Jewelry Mart told ABC 7 News the victims were shot inside Victoga, Inc. Victoga specializes in gold jewelry, according to the gift center website.

Police ordered a shelter in place for people in the area as heavily-armed officers searched the center floor-by-floor. Police believe they have the sole suspect in custody, but are searching the area out of an abundance of caution.

San Francisco Chronicle has more:

SWAT officers responded and were clearing the building, which is across from the Concourse Exhibition Center. They were using dogs to search for a possible second suspect in the large, warehouse-style store, Esparza said.

The neighborhood is home to a number of tech startups, including Pinterest and Zynga — both of which have locked down their employees in their buildings.

We want to ensure you that customers & employees inside our San Francisco store are safe. Our thoughts are with the shooting victims. — REI (@REI) July 12, 2013