PHOENIX — A tanker carrying 3,500 gallons of hot, liquid chocolate rolled over and spilled its contents onto an Arizona interstate.

On Monday, a "river of chocolate" was flowing down Interstate 40 near Flagstaff, Arizona, and blocking traffic, according to the Arizona Department of Public Safety. The crash happened just before 9 a.m., Arizona's ABC 15 reports, and lanes reopened after 1 p.m.

"This will be a sweet cleanup," the department tweeted.

The chocolate in the tanker was being held at a temperature of 120 degrees.

It wasn't immediately known why the truck flipped and how the mess was cleaned up.

Last month, 25 firefighters in Germany used hot water, shovels and blow torches to remove a ton of liquid chocolate that hardened onto a street after a factory accident.

More:Chocolate flows down German street after factory accident. Willy Wonka couldn't be reached for comment

Contributing: Ashley May, USA TODAY.