Rainn Wilson has apologised for a joke he cracked on social media which took aim at transgender people.
The 56-year-old actor, who is best known for playing Dwight Schrute on the NBC sitcom The Office, took to Twitter to say that he has been "educating" himself after speaking to transgender friends.
Rainn had caused consternation when he posted on Twitter: "TIL you can no longer say 'nursing or breastfeeding mother' you have to say 'chestfeeding person.'"