TV bosses at NBC have confirmed reports that hit comedy 30 Rock is to end after one more season.

NBC president Robert Greenblatt announced the official news during a press conference on Monday.

He said, "I know Tina Fey, Alec Baldwin and the rest will deliver some of their best work. We think the world of Tina and hope she will be in the NBC family for years to come."

30 Rock has been a critical hit since it first aired in 2006, and the show and its stars have won a string of Emmy and Golden Globe awards.