By Derek Hawkins

A cyclist was killed at the intersection of Huntington Avenue and Forsyth Street Wednesday afternoon after a collision with a taxi caused his bike to skid under a truck, police said.

Emergency services took the unidentified man to Brigham and Women’s hospital where he was pronounced dead of unknown causes, police said. They described him as a white male in his mid-20s.

J.D. Ferry, a second-year student at the Northeastern School of Law,said he saw the man riding between the taxi and truck on the 400 block of Huntington Avenue.

When they reached the intersection of Huntington Avenue and Forsyth Street, he said, the taxi’s fender hit the back wheel of the man’s bike, which knocked him beneath the truck’s rear set of tires.

“He was face down, not moving after that,” Ferry said. “I’m not sure if the truck driver knew what happened.”

Police arrived moments later, Ferry said, and blocked off Huntington Avenue with caution tape from Parker Street to Gainsborough Street.

They stopped the taxi and the truck on Huntington Avenue.

Northeastern spokeswoman Laura Shea said the man was not a Northeastern student, or in any way affiliated with the university.

The dump truck belonged to MacAuley and Sons Concrete Contractors and was carrying a full bed of scrap concrete.

Police carried the fixed-gear bike, which had a mangled front wheel, to a squad car, along with a cell phone, a right shoe, a messenger bag and a broken helmet.

The man’s family has not yet been notified.