Top Bollywood star Saif Ali Khan accused of assault

Saif Ali Khan and Kareena Kapoor are known as Bollywood's first couple

Police in the Indian city of Mumbai have registered a case against top Bollywood star Saif Ali Khan for allegedly assaulting a businessman.

The incident took place on Tuesday night at a restaurant at the Taj Hotel, reports said.

Khan was dining with actress girlfriend Kareena Kapoor and several other people. The Bollywood couple have been dubbed Saifeena by the paparazzi.

Police said the businessman was treated in hospital for a broken nose.

"The fight started after the businessman Iqbal Sharma, who was sitting on the next table, told the actor and his companions to tone down their volume," a senior police officer told reporters.

Police said they have registered a case of assault against the star and he will be questioned.

This is the second case of assault against the actor - in 2008 he was accused of assaulting a journalist.

Khan has acted in more than 40 movies and won acclaim for Omkara, a Bollywood version of William Shakespeare's Othello.

His much-awaited film Agent Vinod, with girlfriend Kareena, is due to hit the screen on 23 March.

He is the son of former Indian cricket captain Mansur Ali Khan Pataudi and Sharmila Tagore, a former actress.

Recently, Bollywood superstar Shah Rukh Khan was also accused of assault by a filmmaker at a party.

Shirish Kunder said Khan was "drunk" and pushed him and pulled his hair.

Later, Kunder said he had a "heart-to-heart chat" with Khan and they had "resolved all misunderstandings".