An apparent butane or propane leak that seems unrelated to BART shut down a few BART stations Friday morning, and it sounds like all traffic on several Daly City thoroughfares is completely shut down as well.

Update (2:20 p.m.): All BART service has been restored, according to a 2:20 p.m. update from BART seen below. Though riders should still expect delays through much of Friday afternoon.  

Original story (12:35 p.m.): Friday morning BART service in the southern part of the city, as well as Daly City and Colma, was disrupted by a possible hazardous materials leak, according to KGO.  BART initially described the closures in a 10 a.m. tweet as being “due to police activity,” but we have since learned that the cause is a possible chemical leak.

KRON4 adds that the Daly City BART station was evacuated. As of press time for this post, the Daly City and Colma stations are still closed, and trains are not running through those stations. And the Daly City Police Department just added at 11:46 a.m. Friday that “The entire intersection of John Daly Blvd at Junipero Serra Blvd is completely shut down to vehicle and pedestrian traffic. Please try to find an alternate route. Fire and law enforcement personnel are on scene investigating a hazardous material incident.”

Though as of 11:30 a.m., BART says the Balboa Park station has reopened.

The situation appears to be unrelated to the BART system itself. According to NBC Bay Area, “the driver of a truck carrying butane or propane pulled over near a BART track overcrossing in Daly City because he thought something might be leaking.” The station adds that “The driver then called 911 after seeing one of the containers leaking.”

Related: BART Had To Halt All Service Early Friday Morning, But Most Lines Now Running As Normal [SFist]