“Black cab rapist” John Worboys has admitted drugging four more women.
The 62-year-old, who was jailed in 2009 for a string of sex attacks, entered his plea at the Old Bailey.
He pleaded guilty to two counts of administering a drug with intent to commit rape or indecent assault. He will be sentenced on 2 September.
Worboys, who now goes by the name John Derek Radford, targeted women who hailed his cab and drugged them in order to sexually assault them.