A 31-year-old man has been arrested in connection with threats to kidnap and kill a serving police officer.
West Midlands Police said officers from its counter-terrorism unit arrested the man on Tuesday afternoon.
The arrest was made at property in the West Midlands, the force said.
The force had issued an alert to officers and staff after receiving an "anonymous but credible" tip-off and said it was taking the threat "extremely seriously".
Officers have been urged to take extra precautions, including not wearing uniform during journeys to and from work.