Dave Matthews Band Cooperating in Dumping Incident

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Illinois' attorney general has filed a lawsuit that contends the band's tour bus emptied its septic tank while crossing over the Chicago River on Aug. 8.

The band has issued a statement on its Web site that says members have offered to provide DNA evidence to help authorities determine the source of the sewage.

In its statement, the band also says that, if its bus is found to be responsible for the incident, the band will "work quickly to make amends, with the people on the boat and with Chicago."