Generate an explanation for the given claim using the provided supporting material from the paragraph. Please consider the following points while generating an output. 1) The claim will always have supporting proof in the paragraph, and the paragraph will have a clear point of view supporting the claim. 2) There can be instances where direct correlation to the claim is not available. Make use of the sentences in the paragraph to provide a corresponding output supporting the claim. 3) The explanation should be at least one and at most twelve sentences long.
Q: Paragraph: Westfield's Democratic Mayor Brian Sullivan announced the federal lawsuit against the 3M Co., Chemguard Inc. and Tyco Fire Protection Products on Thursday. The manufacturers produce foam used for years at the Barnes Air National Guard Base and the Westfield-Barnes Regional Airport for firefighter training. The city argues the manufacturers knew or should've known the foam chemicals are "persistent when released into the environment and harmful." The lawsuit doesn't specify how much in damages Westfield seeks, but city solicitor Sue Phillips tells the Westfield News it's "looking to be made whole." St. Paul, Minnesota-based 3M, Marinette, Wisconsin-based Chemguard and Lansdale, Pennsylvania-based Tyco Fire Protection Products haven't commented. Westfield is installing filters to treat the contamination. Two public wells have been closed since 2015. Claim: City sues firefighter foam makers over water contamination.
A:
A Massachusetts city is suing the makers of firefighting foam blamed for water contamination.