A little over a week ago, a group of people marched down the streets of Manhattan and called for police to be killed.
But exactly who cried out for violence has been somewhat of a mystery as New York goes through it's most tense moment in more than a decade.
Evidence from photos, video, social-media posts, and interviews suggest that a group -- the New York chapter of the Trayvon Martin Organizing Committee or TMOC -- might have been involved.
There is no definitive proof that TMOC led the call for dead cops, but there is a web of circumstantial ties with the group at it's center.
The bedrock of TMOC's politics, judged by their social-media output, is hatred for police and endorsement for violence against them.
The group seems to blend "black bloc" anarchist street violence with social-media campaigns.
Keeping their organizing online, members can plan and incite without coming out from behind their digital masks until they hit the streets.......(The group did not respond to repeated requests for comments)
Finding TMOC started with an interview with the man who shot the video showing marchers chanting, "What do we want? Dead cops! When do we want it? Now!"
It's impossible to make out any faces in the video, which was shot from a roof at night....The person who shot the video didn't know anything about the people involved....He told me that all he could see was the banner carried at the front of the group which read, "No Cops No Prisons"
An Instagram of that "No Cops No Prisons" banner displays a number of hashtags, including #turnuptheanger, a hashtag associated with TMOC
(The first mention of #turnuptheanger on Twitter, for example, directs to a Facebook page hosted by the Trayvon Martin Organizing Committee NYC.}
It's not the only apparent link between the "dead cops" chant and TMOC....At the beginning of the video and before the call to kill police, you can hear what sounds like, "arms up, shoot back!"....That slogan appears on TMOC's Twitter account.
"The Truth Anout the 'Dead Cops' Chant"