The head of the police sergeants' union has issued a warning to Occupy Wall Street: protest-related incidents that result in injuries to his members could be met with civil lawsuits against any group supporting the encampment.

Ed Mullins, president of the New York Police Department's Sergeant's Benevolent Association, said Thursday that if one of his sergeants is assaulted while policing the protests, his union would file civil lawsuits seeking monetary damages against individual protesters as well as any groups whose support...