Harvey Weinstein, the once powerful movie mogul who was sentenced in March to 23 years in prison for sex crimes, has been charged with six additional counts of forcible sexual assault in Los Angeles, authorities said Friday.

Jackie Lacey, the Los Angeles County district attorney, said the charges stemmed from incidents that happened more than a decade ago. They add to a growing case against Weinstein in Los Angeles, where for decades he loomed large as an influential producer.

In February, Weinstein was found guilty in New York of two felony sex crimes after a Manhattan trial that became a watershed moment for the #MeToo movement.

Even as he was facing that trial, Weinstein was charged in Los Angeles in January with sexually assaulting two women during separate incidents in 2013. In April, Los Angeles prosecutors added another charge, accusing Weinstein of sexually assaulting a woman at a Beverly Hills hotel in May 2010.

The charges announced Friday relate to an incident that happened between September 2004 and September 2005 when, prosecutors said, Weinstein raped a woman at a hotel in Beverly Hills. The charges also accuse Weinstein of raping a woman on two separate occasions in November 2009 and November 2010 at a hotel in Beverly Hills.

Weinstein, 68, now faces a total of four counts each of forcible rape and forcible oral copulation, two counts of sexual battery by restraint and one count of sexual penetration by use of force, involving five victims for crimes dating from 2004 to 2013.

“I am thankful to the first women who reported these crimes and whose courage have given strength to others to come forward,” Lacey said in a statement. “The willingness of these latest victims to testify against a powerful man gives us the additional evidence we need to build a compelling criminal case.”

Juda Engelmayer, a spokesman for Weinstein, said Friday, “Harvey has always maintained that all of his physical encounters throughout his life have been consensual, and that hasn’t changed.” As to the specific charges announced Friday, he said, “We don’t know enough about them to comment.”

Prosecutors said they were seeking to extradite Weinstein from New York, where he has been imprisoned. An extradition hearing has been set for Dec. 11 in Buffalo, New York.

Twenty-one women who have accused Weinstein of sexual misconduct released a statement Friday saying they were “gratified to see the wheels of justice continuing to turn in Los Angeles.”

“It takes a tremendous amount of courage to be part of a trial, and we stand in solidarity with the heroic women who have come forward to seek the justice they deserve,” said the women, who call themselves Silence Breakers and include actresses Ashley Judd and Rosanna Arquette.

“We have always said that we will not be silenced,” they said. “Today’s news once again shows that our voices matter and have been heard.”