These individuals are domestic terrorists who came to Chicago with an anarchist agenda to harm police officers, intimidate citizens and to attack their politically motivated targets," said Anita Alvarez, a prosecutor with the Cook County State's Attorney's Office.

Officials said undercover police infiltrated the group and broke the case after the men allegedly were overheard discussing violence.

The men were arrested Wednesday and have been identified as Brian Church, 20, of Fort Lauderdale, Fla., Brent Vincent Betterly, 24, of Oakland Park, Fla., and Jared Chase, 24, of Keene, N.H.

They are charged with providing material support for terrorism, conspiracy to commit terrorism and possession of explosives.