Police cars, lights, sirens, and helicopter circling over Meridian Park neighborhood

I was woken up by sirens at about 3am. Don't know what's going on, but I can see police cars blocking Wallingford Ave N at 185th, 180th and somewhere near 175th. Their red and blue lights are spinning and there's a helicopter circling over the neighborhood. Whatever's happening, it seems pretty serious.

Anybody know what's going (or what was going) on? Here's a fairly worthless video taken in the dark from too far away.