ABC7 reports that a possible active shooter situation is unfolding in Chinatown this morning. 

POSSIBLE #ACTIVESHOOTER: Avoid 900 Block Pacific Ave in #Chinatown, barricaded suspect. @vicleeabc7 on scene at 11am pic.twitter.com/S6p3TogpWb

— Natasha Zouves ABC7 (@NatashaABC7) June 3, 2016

According to police, a suspect is barricaded on the 900 block of Pacific Avenue. 

#SFPD Working on Barricaded Suspect at 900 Block of Pacific Ave (Pacific,Sacramento, Clay St) Street closure, AVOID AREA.

— San Francisco Police (@SFPD) June 3, 2016

Swat team converging on this apt near Keyes alley. Negotiators on scene. pic.twitter.com/jci83QpRPA

— Vic Lee (@vicleeabc7) June 3, 2016

Traffic being rerouted around 900 blk of Pacific in SF 's Chinatown. #SFPD reports barricaded suspect. @kron4news pic.twitter.com/A3BBYmSWqJ

— Maureen Kelly (@KRON4MKelly) June 3, 2016

#SFPD working on barricaded suspect in #SF's Chinatown. Follow @jajuarezphoto for updates https://t.co/OOSL2zxitp pic.twitter.com/8Z2dBK9SDF

— Jessica Christian (@jachristian) June 3, 2016

Update, 11:15am: The Examiner reports that a resident called 911 around 10am to report that someone was breaking into their apartment, according to police. The suspect barricaded himself into a room when police arrived, and a shot was fired by the suspect, though it's unclear whether that shot struck the suspect, the Ex reports. 

Tense here in Chinatown. "Active shooter" still in bldg. more swat arriving. Started as burglary. pic.twitter.com/5nidmB88R5

— Vic Lee (@vicleeabc7) June 3, 2016

#SFPD says this started as a hot prowl burglary. Resident inside got out safe. @kron4news pic.twitter.com/D8HUJXBMvK

— Maureen Kelly (@KRON4MKelly) June 3, 2016

As of 12pm, police report that the standoff is ongoing:

.@SFPD Incident Ongoing. #SFPD Negotiators and SWAT On Scene. Street Closures Around Area. Shelter in Place for Residents.

— San Francisco Police (@SFPD) June 3, 2016

Now in the 4th hour of standoff with gunman in a Chinatown apt house. Police say negotiators still talking to him. pic.twitter.com/aEzq0cvpNX

— Vic Lee (@vicleeabc7) June 3, 2016

Update, 2:30pm: Police report that the suspect is in custody. Reports indicate he may have run out of the building and been shot.

Flashback and suspect running out may be shot. Ambulance pulling up to alley where he ran

— Vic Lee (@vicleeabc7) June 3, 2016

One person seen wheeled out in a stretcher at Chinatown standoff. @kron4news pic.twitter.com/uJZd9KboZT

— Maureen Kelly (@KRON4MKelly) June 3, 2016

.@SFPD SUSPECT IN CUSTODY. SWAT conducting safety sweep of the area.

— San Francisco Police (@SFPD) June 3, 2016

Update, 3pm: According to SFPD spokesperson Grace Gatpandan, at around 2:30pm, the suspect exited a window and went onto the roof of a neighboring building. He fell through a skylight into a hair salon, which, although buildings in the area had been evacuated, had people inside it. 

Officers fired two flash grenades (non-lethal explosive devices used for purposes of disorientation), and then entered the building. A struggle between officers and the suspect ensued, with six officers and the suspect—and possibly bystanders inside the building—sustaining cuts and lacerations before the suspect was taken into custody. 

The suspect and the injured police officers have been transported to the hospital, all with non-life-threatening injuries. 

Gatpandan notes that this is still an active crime scene and onlookers should continue to avoid the area.