Islamabad: A letter threatening to attack Pakistani President Asif Ali Zardari and Supreme Court Chief Justice Iftikhar Muhammad Chaudhry has been found in the court's parking lot, a media report said on Saturday.

A seven-member police team is examining the letter, reported a news daily.

The team has questioned Javed Altaf, a cameraman of a private TV channel who spotted the letter. He told the investigating body he found the letter lying between two cars.

A police officer said that in the letter, the English words were correctly spelt but the Urdu words were wrongly written.

It seemed a deliberate ploy by the writer to give a false impression, he said.

The investigators were, however, undecided if the letter was a prank or a serious threat.

The officer added that it may be a tactic to delay a hearing into a case like that relating to the target killings in Karachi.