British boxing promoter and manager Frank Warren...

British boxing promoter and manager Frank Warren remained in critical condition as police stepped up the search for a gunman who shot him on a London street.

Police described the attack as an attempted murder and Warren, 37, was unconscious in a hospital with wounds to the chest and abdomen.

Police said the shooting probably was the work of a hired killer.

“He was either a professional killer or very lucky,” said Detective Superintendent Jeff Rees. “There were no wasted shots.”

As Warren arrived at a card show he was promoting, his attacker walked over to the car and fired from about six feet away.