JERSEY CITY — Officials say a New Jersey man already indicted on gang charges has been charged with using Facebook to intimidate witnesses involved in the police investigation.

Acting Hudson County Prosecutor Esther Suarez said Thursday that Laquan Clark, of Jersey City, threatened the lives of witnesses who were depicted in videos posted on the social media site.

Clark faces first-degree witness tampering charges, which carry a sentence of up to 20 years.

Suarez says that Clark's Facebook page posted videos this week showing witness interviews stemming from an investigation into gang activity along with threats against witnesses' lives.

Clark and 21 others were indicted in April on gang, assault, robbery and drug charges. He was released on bail before he was arrested Thursday.

It's unclear whether he has an attorney.

Copyright 2016 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.