Sources told the NBC Bay Area Investigative Unit the Santa Clara County District Attorney has filed three felony charges of possession of assault weapons against 49ers All-Pro linebacker Aldon Smith. The charges stem from a 2012 house party hosted by Smith where he was stabbed and two others were shot.

Smith is currently on “indefinite leave” from the 49ers after San Jose Police arrested him at 7 a.m. on Sept. 20 on suspicion of driving under the influence and possession of marijuana.

Smith's civil attorney Matthew Conant did not return calls immediately seeking comment although it's unclear if he is representing Smith with his criminal charges.

At a regular Wednesday 49ers' news conference Coach Jim Harbaugh said he didn't have further comment past the team's formal statement which read in part that the "49ers organization is aware of recent developments with Aldon" and they realize "the serious nature" of the situation. Team officials said they would "continue to monitor it closely" but because it is a legal matter they wouldn't be speaking about it.

Smith's DUI arrest came about two weeks after the NBC Bay Investigative Unit first broke details of two civil lawsuits against Smith after two guests at his party were shot last June.