LONDON, Dec 7: British police were probing on Tuesday why a top secret file detailing security arrangements for the visit of Pakistani President Pervez Musharraf to Britain this week was found abandoned on a London street.

The 17-page document was reportedly found by a delivery driver in a brown envelope on upmarket Curzon Street hours before Gen Musharraf and his wife touched down at Heathrow from Washington on Sunday.

Titled "Visit of His Excellency General Pervez Musharraf, President of the Islamic Republic of Pakistan", the papers reportedly disclosed the security arrangements at the London hotel where the president and his entourage were staying.

The dossier containing maps showing Musharraf's movements, explaining how to identify undercover police, and giving details of police radio channels and secret police call signs, was given to the Daily Mirror newspaper.

"The documents did not detail personal protection arrangements for the president," said a spokesman from London's Metropolitan Police. "His personal protection was not affected.

"Our understanding is that they were found by a member of the public and handed in to the Mirror, who gave them to us yesterday," he said. "We have reviewed our policing operation, and liaised with the Pakistan High Commission."

An investigation has been launched by the police's Directorate of Professional Standards into the circumstances surrounding the loss of the documents. Musharraf is in London for talks with British Prime Minister Tony Blair. The Pakistani High Commission and Blair's office did not comment on the security blunder. -AFP