Harvey Weinstein has arrived at a Manhattan courthouse for arraignment on charges alleging he committed a sex crime against a third woman.

Courthouse guards told people arriving for jury duty to wait or use a different entrance as Weinstein arrived.

An updated indictment alleges the former movie mogul performed a forcible sex act on a woman in 2006.

The new charges include two counts of predatory sexual assault, which carries a maximum sentence of life in prison upon conviction.

Manhattan District Attorney Cyrus R Vance Jr said the 66-year-old Weinstein is charged with "some of the most serious sexual offences" that exist under state law.

Lawyer Ben Brafman said Weinstein maintains all the allegations are false and he will be vindicated.

A grand jury previously indicted Weinstein on charges involving two women.