A standoff has been going on for much of Thursday forcing the closure of a block of 24th Street in San Francisco's Mission District, and it involves a possibly armed suspect.

SFPD officers have reportedly been on the scene since 8:30 am Thursday morning, and by 11:30 am, according to postings on the Citizen app, SWAT team members were arriving along with an armored BearCat vehicle. The armored vehicle seems especially odd given that initial police reports said the suspect was only armed with a knife.

This is all happening on the 3000 block of 24th Street, between Harrison Street and Treat Avenue, and the block was closed all day to vehicle traffic.

As KRON4 reports, the SFPD's Crisis Negotiation Team has been on the scene and is attempting to bring a peaceful resolution to the situation.

The SF Standard identified the man involved in the standoff, through neighbors, as a Russian immigrant who lives in Casa de la Misión, a permanent supportive housing complex for formerly homeless seniors. He could reportedly be seen yelling from a third-floor window.

Image via Citizen app