MBTA Transit Police report arresting a man they say threatened to shoot up a bus on Cummins Highway Tuesday morning because the bus wasn't moving.

Police say the driver opened the bus's doors to let panicked passengers out - and they began running toward Mattapan Square looking for cops to flag down as Jawan Bristow, 27, continued his threats.

According to a police report, the incident began shortly after 8:30 a.m. on a bus at Cummins Highway and Brockton Street, when Bristow got out of his seat in the rear of the bus and yelled: "Yo, bus driver, if you don't move, I'm gonna pop everyone on this bus, including the babies. I have the gun right here in my bag." He then began to walk to the front, the report says. "I have a Glock. I'm getting the women first."

After the driver opened the doors, "the patrons of the bus started to run out of the bus with their children climbing over snowbanks and falling to the ground to get away from Bristow." The driver then radioed for help, to which Bristow allegedly replied, "That's right, get the cops down here, I'm not leaving. They know who I am. I own Mattapan."

The police report states a pat frisk showed Bristow did not actually have a gun. However, he will be arraigned today in Dorchester District Court on charges of assault with a dangerous weapon, disturbing the peace, interfering with public transportation, threats to commit a crime and disorderly conduct.