Owners of a Chicago tour boat company whose customers were drenched in human waste from the Dave Matthews Band's tour bus are suing the rock group.

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Mercury Skyline Yacht Charters Inc., which owns the city's Little Lady tour boat, say the Matthews bus dumped human excrement as it crossed a downtown Chicago River bridge last August under which the plaintiff's boat was passing, the Sun-Times said Thursday.

The suit, filed Wednesday, says the "foul-smelling, brownish-yellow liquid" drenched children, senior citizens, people with disabilities and a pregnant woman.

Mercury wants compensatory damages in excess of $50,000 and punitive damages in the amount of $5 million.

The driver of Matthews' bus was charged last month with illegally dumping 800 pounds of raw sewage onto the boat.