Collocations for police - noun

armed, mounted | plain-clothes, uniformed | anti-riot, riot | paramilitary, secret, security | federal, local, national, state

call | alert, tell

arrest sb | patrol sth | interview sb, question sb | investigate sth | appeal for sth
Police have appealed for witnesses to come forward.

chief, constable, officer | spokesman | headquarters, station | cell
He spent the night in a police cell after his arrest.

custody | car, helicopter, van, vehicle
an unmarked police car

driver, marksman | dog, horse | authorities, force, service | unit | enquiries, investigation | escort
The visiting fans returned to the railway station under police escort.

patrol
A routine police patrol spotted signs of a break-in at the offices.

raid
Nine arrests were made in a series of police raids across the city.

presence
There was a huge police presence at the demonstration.

protection
All prosecution witnesses were given police protection.

cordon, lines
Some protesters managed to break through the police cordon.

chase | informer | brutality, harassment

helping the police with their enquiries
No arrest has been made, but a man is helping the police with their enquiries.