A four-vehicle chain reaction crash occurred about 7:45 a.m. Friday on Route 3 northbound at Wedgewood Drive just south of North Main Street in Columbia.

Police believe motorists were possibly distracted by an officer assisting a motorist on the side of the road in that area at the time of the incident. A trailing vehicle rear-ended the vehicle in front of it, resulting in that vehicle doing the same, and so on.

No injuries were reported in the incident.