Winter is coming, again, after Disney unveiled a sequel to the mega-hit animation Frozen.

At the company's annual shareholders' meeting in San Francisco today, Disney executives officially announced plans for Frozen 2.

And its official Twitter account said: "Forecast: Winter weather ahead! @DisneyAnimation developing Frozen2 with Chris Buck and Jennifer Lee."

And Kristen Bell, who voices Anna in the film, tweeted: "Dreams really do come 2!!! FROZEN2 itsofficial."

Since its release in November 2013, Frozen has become a juggernaut for Disney. It made nearly 1.3 billion dollars (£900 million) at the global box office and generated a massive merchandising revenue stream.

The film also won the Oscar for best animated feature.

Walt Disney chief executive Bob Iger announced that directors Chris Buck and Jennifer Lee will return for the sequel but no actors or other details have been confirmed.

A Frozen short is to play in front of Disney's latest release, Cinderella.