Call it a chocolate mess.

>> Read more trending news

A tanker truck filled with liquid chocolate caused a big mess on an Arizona interstate highway Monday, forcing the road to be closed for more than four hours, KNXV reported.

According to the Arizona Department of Public Safety, a tanker truck carrying 3,500 gallons of chocolate rolled over on the westbound lanes of I-40 east of Flagstaff, KSAZ reported.

The chocolate was kept at 120 degrees, according to a bill of ladling reviewed by the Arizona Department of Public Safety.

Traffic was stopped from 9 a.m. until 1 p.m., KNXV reported. It is unclear what caused the tanker to roll over, the television station reported.