When it comes to gathering intelligence, NYPD detectives don't just go overseas to monitor terrorism. The NYPD also sent personnel to Ferguson, Missouri, where protesters are demonstrating after a grand jury there decided not to indict a white officer who killed a young, black man.

“We have a number of our detectives out there, have had them out there for over a week to help out in terms of intelligence we have on some of the professional agitators who are involved in these types of activity,” Commissioner William Bratton said.

The NYPD is also hoping to learn from Ferguson’s experience, he added.

Next month, a Staten Island grand jury is expected to decide whether to indict any NYPD officers in the killing of Eric Garner who was choked to death over the summer during an arrest for selling loose cigarettes.

It likely won’t be the only grand jury in the next couple months to consider criminal charges against a New York cop. Bratton said he expects Brooklyn District Attorney Kenneth Thompson will convene a grand jury to investigate last weeks’ shooting death of Akai Gurley. Rookie Officer Peter Liang killed Gurley in a darkened, public housing stairwell. Bratton was quick to call that shooting a tragic mistake.

Thompson’s Office declined to talk about the likelihood of convening a grand jury, but provided a prepared statement saying the office will conduct a fair and thorough investigation.