A suspect officers believe may be armed with a knife has barricaded themselves in a downtown Sacramento apartment Wednesday.

Sacramento police say, just after 2:30 a.m., officers originally responded near 9th and K streets to investigate a 911 hang-up call.

When officers arrived, people found two people involved in some type of disturbance. Officers separated the people, but that's when police say the suspect retreated back into an apartment.

With the suspect allegedly barricaded with a knife, SWAT and crisis negotiators responded to the scene to try and get the person to surrender.

Expect a large law enforcement presence in the area for the time being.

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