COLORADO -- The train that derailed in Boulder on Tuesday afternoon was carrying plastic beads -- a non-hazardous material -- according to police.

Hazmat crews initially responded to the scene, which was near Arapahoe Avenue between 55th and 63rd.

Six cars in total were knocked off the tracks, but only the one containing plastic beads flipped over. The other five cars were empty.

The cause of the derailment is being investigated by the Boulder Police Department and BNSF Railway.

Businesses within 100 yards of the derailment were evacuated out of precaution, but those evacuations were lifted after about an hour.

No injuries were reported.