Updated 08/10/16 – 9:48 a.m.

CHICAGO (CBS) — A semi-trailer truck caught fire at a toll booth on the Indiana Toll Road near Portage on Wednesday, setting the toll plaza on fire, and forcing police to shut down the toll road for part of the morning rush.

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Indiana State Police said a truck stopped under the awning of a toll plaza near Portage caught fire around 6 a.m.

Flames spread to the toll plaza itself, prompting police to shut down the Toll Road in both directions.

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All westbound lanes have since reopened, and police expected three eastbound lanes to reopen around 9:45 a.m., but the remaining lanes will remain closed for a structural analysis of the damaged canopy.

No injuries were reported, but the fire caused an estimated $1 million in damage to the truck and toll plaza. The cause of the fire was under investigation.

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The truck was carrying a load of potatoes and apples, police said.