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ST. LOUIS – Part of Interstate 55 is closed after a serious accident in the northbound lanes.

The accident happened shortly before 7 p.m. near Potomac. Capt. Garon Mosby with the St. Louis Fire Department confirms multiple vehicles were involved in the accident, but the exact number is undetermined.

Mosby says four children were taken to an area hospital. Two of them are in critical condition, the other two are stable.

Accident reconstruction was called to the scene.

The highway reopened around 8:30 p.m.

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