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ST. LOUIS (KSDK) - A serious accidentblocked lanes on northbound Interstate 55 at Potomac Thursday morning.

The two-vehicle accident happened after 10:30 a.m. All lanes were briefly shutdown while crews cleaned up the accident.

There's no word on what caused the accident or if anyone was injured.

Around 11:30 a.m. traffic started to get through the two right lanes. A few minutes later all lanes reopened.