TPM has learned that police are investigating reports that the suspect in the Wisconsin Planned Parenthood firebombing may have attended anti-abortion protests at the clinic.

Investigators are looking into the possibility that the man accused in the weekend bombing of a Planned Parenthood clinic in Wisconsin may have been involved with anti-abortion protests there in the past, a police official told TPM on Wednesday.

Francis Gerald Grady, 50, was charged Tuesday with two federal crimes in the attack, which took place Sunday night in the town of Grand Chute. No one was injured and the explosion did only minor damage to the clinic.

Grand Chute Police Chief Greg Peterson said investigators in the case learned that Grady may have been involved in past protests at the office. The information was so far unconfirmed, Peterson said, but it is being looked at closely by the team of local and federal investigators handling the case.