Claims Labour officials in Birmingham paid drug addicts £5 a time to impersonate voters at polling booths in Aston in this year's city council elections are being investigated by West Midlands Police.
A spokesman for the Labour Party last night said the allegations, aired on a BBC TV Newsnight programme on Wednesday, were passed to the Director of Public Prosecutions when the party became aware of them for "a thorough investigation".
However, Roger Baker, Labour's press officer, made it clear he believed there was no evidence to suggest the claims were true.
According to Newsnight, one anonymous addict earned £125.
Another contributor, named as Faisal but not seen, claimed a Labour official had tried to offer him £200 for his vote.
The Newsnight programme was partly based on allegations levelled by Liberal Democrat supporters, who claim their candidate in Aston during the 2007 elections failed to win the seat as a result of a Labour smear campaign. An election court is currently investigating the claims, which Labour deny.
Mr Baker added: "Since the beginning of October the Labour Party has repeatedly urged the BBC to forward their evidence and details of individuals alleged to have been involved to the police and to ourselves to assist these investigations. We are still awaiting co-operation from the BBC.
"This is now a legal matter and it would be inappropriate to comment further, however we are disturbed that the basis of these allegations seems to be testimony from political opponents with a vested interest in maligning local Labour Party members, the anonymous and a self confessed drug addict.
"The Labour Party expects the highest standards of behaviour from our members and representatives and, where these standards are found not to have been met, the strongest disciplinary action is taken."
