Iris's stomach was pumped and she was given a precautionary brain scan, it was reported. Police were then called and the two-year-old was kept in hospital for observation. Road to Perdition star Law, 29, was said to have been told the news while filming in the US. A Scotland Yard spokesman said: "We were called at 4.11pm Saturday afternoon by a London hospital regarding a two-year-old female child that was believed to have swallowed half a tablet of ecstasy. "The child had been attending a children's party on Saturday where she was believed to have picked up a tablet that had been left on the floor of the premises on Old Compton Street. "The premises had been used as a bar and nightclub on the Friday. "It is believed that the child's mother discovered the two-year-old with an obstruction in her mouth. She managed to retrieve one half before it could be ingested.

"An ambulance took the child to the hospital where she was kept in for observation overnight. She was released Sunday morning. "The tablet has been confirmed as ecstasy," he said. A spokesman for the Soho House Club, where the incident happened, refused to comment on the matter, saying only: "There was a private party. "It was a private matter and because it was regarding members I am not allowed to say any more." Police source said there was no suggestion that the parents were guilty of neglect, adding: "There are no plans to take action against the parents of the victim. "This is being considered as an unforeseen accident outside the parents' control."

The licensing branch of the Metropolitan Police has been informed and will decide whether to take further action.