msnbc.com
updated 10/26/2010 12:08:48 PM ET 2010-10-26T16:08:48

A London taxi driver who was jailed for drugging 19 women and sexually assaulting 12 may have actually raped as many as 102 over five years, the BBC reported on Tuesday.

Nineteen women have come forward since John Worboys' conviction in April 2009, the BBC reported. At the time, when police connected him to 83 crimes.

The 54-year-old attacker, who critics believe was allowed to remain free for so long because of police blunders, is known as the "back cab rapist," The Guardian reported.

"There is a high possibility there are more victims out there," the BBC and Guardian quote a police spokesman as saying. "The difficulty is that a large number of the women do not know whether they were raped or not."

Worboys attacked his female victims at night, offering them champagne laced with sedatives and sleeping pills, according to The Guardian. He fooled young professionals into having the drinks by saying he had just won the lottery.

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An investigation found that Worboys was able to avoid conviction for so long because police did not take his victims seriously, and tended to doubt that a driver of one of London's iconic black sedan taxis would be capable of such attacks, The Guardian reported.

"The victim cannot remember anything past getting in the cab," one detective wrote in his report dealing with a 2007 victim. "It would seem unlikely that a cab driver would have alcohol in his vehicle, let alone drug substances."

Worboys will serve a minimum of 8 years in prison.

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