Emergency crews responded to two reports of auto fires within two hours of each other early Thursday morning.

The first car fire, which may have been intentionally set, broke out about 4:30 a.m. in the 500 block of East Lincoln Highway.

The second car fire, which likely was caused by a mechanical issue, started about 6:30 a.m. in the 500 block of Lumber Street between Manor Alley and North Sixth Avenue.

Authorities are investigating.