This is a fast moving story - so please stay with me:

The arrest was caught on video:
Youtube Video

The man arrested this evening in Baltimore is renowned police watchdog Baltimore Spectator:

.@BaltoSpectator getting arrested pic.twitter.com/2UJbkKVHuh

This is notable because two years ago Spectator live streamed an interaction with a S.W.A.T. team at his house, that was a quasi-armed standoff, and lasted for several hours.

— Justin Fenton (@justin_fenton) April 21, 2015

This tweet being sent while under arrest from inside @BaltimorePolice Western District station

— Agitator In Chief (@BaltoSpectator) April 21, 2015

Shooting into a crowd (photography) RT @mdfop34: @BaltoSpectator @justin_fenton @BaltimorePolice what did you do now

— Agitator In Chief (@BaltoSpectator) April 21, 2015

All said, I’m WORRIED for @BaltoSpectator primarily because I’ve seen him harassed firsthand for speaking. That’s it. I speak. You speak.

— Meddle Bear Solid (@GotdamBear) April 21, 2015

They’ve deleted all of the footage on @BmoreBloc’s camera. @BaltimorePolice are violating our 1st Amendment rights.

— Agitator In Chief (@BaltoSpectator) April 21, 2015

@catemaher @BaltimorePolice um, I’m a photographer not a protestor. Know the difference and you know a lot.

— Agitator In Chief (@BaltoSpectator) April 21, 2015

Happening now. Trying to find out why the footage was deleted. pic.twitter.com/ptcOeRg4pQ

— Agitator In Chief (@BaltoSpectator) April 21, 2015

Being released now pic.twitter.com/5eIemrRenF

— Agitator In Chief (@BaltoSpectator) April 21, 2015

update #2: he has since become a sort of super hero:

Mr @BaltoSpectator races into burning townhouse after released from being detained by BPD @ #FreddieGray Rally pic.twitter.com/gxd3Ae8db7

— Activist News Net (@ActivistNewsNet) April 21, 2015

.@Baltospectator released from police custody, then ran into a burning house pic.twitter.com/S24JBDEc0J

— Justin Fenton (@justin_fenton) April 21, 2015

Um, so like I literally just ran into a burning building and put out a fire. The hell

— Agitator In Chief (@BaltoSpectator) April 21, 2015

And no, I couldn’t breathe. @BmoreBloc and I searched for kids first. A @BaltimorePolice Lt. ran in with us. He helped us put it out

— Agitator In Chief (@BaltoSpectator) April 21, 2015

@BaltoSpectator some kinda night you’re having.

— lucky (@intheskywithd) April 21, 2015

Update #3:

A large much more vocal, visibly agitated crowd just reconverged in front the police station. pic.twitter.com/mv1xS25YoV

— Agitator In Chief (@BaltoSpectator) April 21, 2015

Crowd beginning to get more and more animated. Great amount of tension and anger in the air. Police looking real nervous.

— Agitator In Chief (@BaltoSpectator) April 21, 2015

This journalist “Bilal” is covering the demonstrations for the Turkish government state owned media. #FreddieGray pic.twitter.com/rtvjK8jjDa

— Agitator In Chief (@BaltoSpectator) April 21, 2015

@kbat33 @BaltoSpectator I totally agree too many vets. Why are the police wearing combat gear?

— amy kelly (@ipad_amy) April 21, 2015

Lt. Thompson. First while arresting me for public photography. Then later after we fight a fire together. #surreal pic.twitter.com/eWzk9zY0Qk

— Agitator In Chief (@BaltoSpectator) April 22, 2015

update #4:

Funny thing, my citation says I was detained for “protesting” although it’s clear what I’m doing here is photo journalism & tweeting.

— Agitator In Chief (@BaltoSpectator) April 22, 2015

disclaimer: I was personally involved in that standoff, and spent most of that evening on the phone with the Chief of Police, in an attempt to keep shots from being fired. no shots were fired, and he was not convicted of any crime in the event. I consider him a friend, and fellow police observer.

I will keep this updated as more information comes to light.