A one-car rollover accident early Tuesday morning sent four people to Erie County Medical Center and forced authorities to close one entrance and one exit ramp off the Youngmann Highway, Town of Tonawanda police reported.

No serious injuries were reported among the four people, believed to be in their 20s and 30s, after the vehicle went off the Elmwood Avenue exit ramp, went airborne and rolled over. The vehicle landed in a grassy area between the exit and entrance ramps off the eastbound Youngmann Highway, police said.

Speed appeared to be a factor, Town of Tonawanda Police Lt. Nicholas A. Bado said of the incident, which occurred shortly after 3:15 a.m. Police said they had no information about any alcohol or drug involvement. No charges have been filed.

Authorities had to close the Elmwood Avenue entrance and exit ramps for several hours after the mishap.