London police say they're hunting a gunman after an ex-Russian banker was shot and left critically ill in an attempted assassination in east London.

Officers said Friday in a statement that German Gorbuntsov is in a "critical, but stable" condition after he suffered several gunshot wounds on Tuesday night outside an apartment block on the Isle of Dogs, close to London's Canary Wharf financial district.

Police are seeking a white male seen fleeing the scene, but declined to confirm reports that Gorbuntsov is in a coma.

Gorbuntsov's lawyer Vadim Vedenin was quoted as telling Russia's Kommersant newspaper that the ex-banker had recently supplied new information to an inquiry into an attempted 2009 slaying of another Russian banker.