He got involved in a love affair.

Police dogs are very effective in tracking criminals.

I went to the police station yesterday.

The head of the police station explained the details of the incident to the press.

A municipal police was established in my town.

He was terrified of living in a police state.

He was caught by the secret police.

The Jinan incident of 1928 was an important event in Chinese history.

The Federal Bureau of Investigation is investigating the case.

The Mobile Investigation Unit rushed to the scene.