'Don't be alarmed'.
That is the message from police chiefs if you spot military helicopters flying over Bristol on Monday.
A spokesperson for Avon and Somerset Police said the force takes part in training with the Royal Air Forces to help officers' professional development.
The tweet reads: "We’ll be working on a training exercise tomorrow alongside @RoyalAirForce @MCA_media and search and rescue.
"Please don’t be alarmed if you see military helicopters taking off and landing around the force area.
"It’s part of ongoing work to keep you safe."
They added: "Give us a wave if you see us."
Dozens of people responded to the post saying they would keep an eye out for the impressive planes.
One said: "See this quite regularly down Avonmouth."
Another wrote: "Sounds like great fun. Hope the exercise goes well."
