waterman avenue near park center. that's from the police department and from fire units responding to reports of 20 victims in the shooting incident, 1300 block of south waterman. police department working to clear the scene. harry houck has been seated next to me here, former nypd. sadly, all too familiar with covering these active shooting scenarios. listen, we don't know a lot. as art was just discussing and we were discussing recently, you set the perimeter. and we don't know where this is happening. i don't want to say anything that's not accurate. we're hearing reports where this possible i could be, but walk me through what police are doing right now. >> well, the first thing they're doing is trying to find out where exactly the shooter is. and at the same time talking to witnesses, to see if there's more than one shooter. the report is there are 21 people possibly shot here. it hasn't been confirmed, but the fact that if there is, there's a good chance there's a second shooter with that many