The Labour party has formally reported members of Sir Keir Starmer's leadership campaign team to the Information Commissioner, accusing them of hacking into the party's membership database, the BBC has learned.
The allegations were made against two members of Sir Keir's team - one of them is his compliance official.
They were passed to the Information Commissioner's Office on Thursday.
Sir Keir and his team have strenuously denied the claims.
The allegations are serious, and the confrontation has engulfed the campaign in bitter recrimination.
