Traffic was moving slowly on a main road in Decatur after a wreck that left a grain truck on its side Thursday morning.

Workers on the scene said a mechanical malfunction appears to have caused the truck's trailer to come loose and roll over on 6th Avenue near Church Street around 8 a.m. It was partially blocking the right southbound lane.

#TrafficAlert

Expect significant delays at 6th AVE and Church ST.

18 wheeler and grain truck accident with roll-over.

Trailer will need to be unloaded before it can be flipped upright.

— Decatur, AL Police (@DecaturALPD) April 19, 2018

The truck itself stayed upright and the driver was not hurt.

Decatur police said the cattle feed in the trailer needs to be unloaded before they can flip it back over and remove it from the scene.

The truck's owner came to the accident site and told WAAY 31 he's thankful no on was hurt.

Police also did not say how long it might take to clean up the mess.