CHARLOTTE -- Two men died in a crash Sunday morning on Interstate 77 northbound.

It happened just north of the Sunset Road exit.

Troopers say the accident involved a street sweeping truck from Major Cleaning Incorporated.

One of the victims is from Pineville. The other is from Charlotte. Their names have not been released.

They say an off-duty firefighter called in the crash at about 7 a.m. but it appeared the crash happened a few hours earlier.

Investigators are trying to determine if rain played a part in the crash.