VIDEO: School bus accident in New York

(NBC) - A school bus flipped in New York City on Thursday morning injuring three dozen people as the peak morning rush got underway.

Authorities said three of the 36 adults hurt in the 6:00 a.m. accident north of the cross Bronx expressway were in serious condition while the injuries to the other victims were said to be minor.

Officials said a preliminary investigation indicates the school bus driver tried to exit the highway from the middle lane, which caused the bus to flip.

It wasn't clear where the bus was headed.

Aerial video showed a number of people milling about on the ground, some standing, some setting as authorities tended to the injured.

Traffic was heavily impacted in the area.