Updated June 27, 2012, 2:45 p.m.

A teen was stabbed on a MetroBus near F and 21st streets at about noon Wednesday.

Another passenger stabbed the victim, about 17 or 18 years old, in the upper torso after the two got into a fight on the bus, Washington Metropolitan Area Transit Authority spokesman Dan Stessel said.

The victim is in critical condition after being transported to a local hospital, Stessel said. The injury is “not considered serious,” according to a GW Alert, which said the suspect’s weapon was allegedly a razor.

The suspect, described as a black male in his 40s, fled the scene but was last seen headed west on F Street, according to the alert.

The bus was headed to Fort Totten.