Islamabad - Some Western diplomats are attaching dummy bombs to their vehicles to test the alertness Pakistan police amid deteriorating security caused by suicide attacks, a media report said on Friday.

The interior ministry said an "unidentified object" found recently in the vehicle of Danish embassy security advisor Chris John turned out to be a fake bomb, the Daily Times newspaper reported.

John told police he was conducting a "mock exercise" to determine the efficiency and alertness of the police, the paper said. The Danish embassy was bombed in June 2008.

An interior ministry letter obtained by the daily quoted Islamabad police as saying that some other foreign missions were also "caught" during the similar exercise.

"When the suspected objects are traced or recovered by police from the diplomatic vehicles, they (diplomats) simply say that this is a mock exercise," the letter said.

Terrorists have carried out a series of suicide attacks since mid- October, killing more than 300 people. (dpa)