LONDON (Reuters) - London's Metropolitan Police said on Thursday it was investigating "a small number of bets" made on the timing of next week's national election, with seven of its own police officers identified as having placed such bets.

"We have agreed a joint approach with the Gambling Commission, who are the appropriate authority to investigate the majority of these allegations," Detective Superintendent Katherine Goodwin said in the statement.

"There will, however, be a small number of cases where a broader criminal investigation by the police is required."

(Reporting by Muvija M, Editing by Kylie MacLellan)