A car crash claimed the life of a teenage bicyclist in Smithtown on Wednesday afternoon, Suffolk police said.

Alex Helkin, 25, of Farmingdale was driving his Mazda westbound on Route 347 when his car struck 15-year-old Nicholas Svercel of Ronkonkoma, who was riding his bicycle northbound across the road at the intersection of at Terry Road at 4 p.m., according to 4th Squad detectives.

Witnesses told police Helkin had a green light when the bicyclist started to cross. 

Svercel had been riding with three other teenagers and he may have believed the light changed, allowing him to cross the roadway, police said. 

He was pronounced dead at the scene.  The Mazda was impounded for a safety check as the investigation is continuing.