Operation Temperer was and is a large scale police operation that involved the deployment of thousands of armed police officers and soldiers in key public sites across the UK. This was done in response to terror attacks such as the Westminster bridge attack, the London Market attack and the Ariana Grande Bombing. Within days of the order being given soldiers and armed police could be seen patrolling the streets of London and other cities. They also had a visible presence on public transport and places likely to be a terrorist target.