They may have been cops, but the video still reveals the militarization of police work. Muriel Kane at Raw Story shares a statement released by security at the G20:
"Military members supporting the G20 Summit work with local law enforcement authorities but do not have the authority to make arrests. The individuals involved in the 9/24/09 arrest which has appeared online are law enforcement officers from a multi-agency tactical response team assigned to the security operations for the G20. It is not unusual for tactical team members to wear camouflaged fatigues. The type of fatigues the officers wear designates their unit affiliation.
Prior to the arrest, the officers observed this subject vandalizing a local business. Due to the hostile nature of the crowd, officer safety and the safety of the person under arrest, the subject was immediately removed from the area.”
Read more at Raw Story.