Ambulance staff are working with emergency services colleagues at The Quarry in Shrewsbury, where the Shrewsbury Flower Show is currently being held, after an anonymous call making a serious threat.
Three paramedic officers and the Hazardous Area Response Team are currently at the location.
A West Midlands Ambulance Service spokesman said: “As a precaution, West Mercia Police have put a cordon in place and areas of the park are being evacuated.
“Please avoid the area at present and follow the advice from police officers at the scene.
“Tonight’s firework display has been cancelled as a precaution.”
A Spokesman for West Mercia Police said: We’ve received an anonymous call making a serious threat to The Quarry in Shrewsbury, where the Shrewsbury Flower Show is currently being held.
As a precaution, a cordon has been put in place, and areas of the park are being evacuated. A thorough search of the area is being undertaken by specially trained officers.
Please avoid the area and keep an eye on our social media channels for further updates.
“Superintendent Damian Pettit, said: “I know that the Shrewsbury Flower Show is a big event that has attracted significant crowds, particularly with today’s lovely weather, and that this threat may be alarming for visitors to the show.
“I would urge visitors to stay calm and follow the advice of officers in the area. They are there to ensure your safety and the safety of those around you.
“Thank you to all the visitors who have already cooperated with our officers, it is much appreciated and a huge help in situations like this.
“At this stage we are assessing the threat and so are unable to provide any further information, but will update you as soon as possible via our Facebook and Twitter accounts, as well as on our website.”