A teen is fighting for his life after getting shot in stomach aboard a city bus this afternoon in Brooklyn, authorities said.

The bloodshed occurred around 4:40 p.m. in the back of a B60 bus travelling on Wilson Avenue in Bushwick, a transit spokeswoman said.

After the driver heard the commotion, he pulled over and opened the doors, sending the panicked passengers fleeing, the spokeswoman said.

The driver then found the 18-year-old victim, who was rushed to Elmhurst Hospital in critical condition.

The suspect, described by witnesses as in his 20s and dressed in blue, fled.

Police pulled surveillance footage from a nearby bodega.