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IAAF President Sebastian Coe has denied a report which claims he warned UK Athletics (UKA) about allegations of bribery before the vote was held for the 2017 World Championships.
The boss of UKA, Ed Warner, said he was warned by a "very senior IAAF person" about brown envelopes of cash being distributed before the vote took place, a vote which London subsequently won.
Coe, who was elected president last August, has repeatedly denied he knew about major corruption within athletics during his time as IAAF vice-president but the Daily Mail claim that two witnesses insist Coe warned the bid team at the time.
However, the IAAF has released a statement denying the allegations saying he had "no knowledge of bribes being offered or received".
Coe led London's final presentation bid for the 2011 vote for the right to host the 2017 championships, beating off stiff competition from Doha.
The Qatari capital however, was subsequently awarded the next World Championships, due to take place in 2019.
The Qatar Athletics Federation has always denied any wrongdoing during the voting process, but according to Warner the IAAF's ethics commission is investigating both Doha bids.
French prosecutors meanwhile are looking into the decision to award the 2021 World Championships to Eugene, Oregon, the town which has historic strong links with sportswear giants Nike. Coe resigned as an ambassador for the company last month after heavy criticism of his continuation in the position following his election to head the IAAF.
Eugene is believed to have been awarded the right to host the event without the usual full bidding process taking place first.