US dramas Chicago Fire, Revolution and Parenthood have all been renewed by NBC.

The first two are currently airing their debut seasons while Parenthood - a late-night staple on RTÉ Two - has been running for four seasons.

Chicago Fire's return for a second season was seen as a virtual certainty due to NBC moving forward with a pilot for a spin-off series based around the police.

NBC has still made no announcement about the future of sitcoms Parks and Recreation and Community - both cult hits on this side of the Atlantic.