A tractor-trailer hauling a full load of fish caught fire Tuesday morning and caused heavy delays on I-75 North in Cobb County.

The incident just after 11 a.m. shut down all northbound lanes at Chastain Road. All lanes reopened around 2 p.m.

The fire was extinguished around 11:30 p.m. and the exit ramp was reopened just before noon.

It is unclear what caused the fire.

In other news:

Fulton County police detective Patrena Smith gives account of police chase and deadly crash. Video by John Spink/AJC