Two class action lawsuits filed on behalf of residents of Cameron, Mo., allege an area plant caused a sudden outbreak of brain tumors among residents.

Attorney Grant L. Davis alleged in the lawsuits filed against unnamed companies that arsenic and lead found at the Rockwood Industries plant were likely to blame for the growing number of brain tumor diagnoses among the town's citizens, KMBC-TV in Kansas City, Mo., reported Wednesday.

The people who are responsible for illegally dumping these materials, they need to come forward and do medical monitoring and help, Davis said.

While the Environmental Protection Agency is conducting tests of area water supplies and other sites, experts have yet to prove that the elements found at the plant are responsible for the brain tumors.

KMBC-TV said the lawsuits, which target those controlling all area sites where similar chemicals have been found, include one for property damage as Davis alleges Cameron residents' property was negatively affected by the industrial developments.

Cameron is in northeastern Missouri about 30 miles east of St. Joseph, Mo.