The London Ambulance Service has been criticised for pledging to try and avoid using sirens during the Armistice Day silence, with people asked whether this would endanger life.
The service said it would try and avoid using sirens between 10.45am and 11.10am "where safe and possible" to show respect during the two-minute silence at 11am today.
People protested and said it could prove more disrespectful than not using sirens if someone were hurt.
The ambulance service responded to one critic, saying it was something they had done "for years" and reiterating it would only do so when safe.
The ambulance service marked the two-minute silence at its Waterloo HQ.
An spokeswoman for the service told HuffPost UK: “As a mark of respect this Armistice Day, we asked our ambulance crews to limit the use of sirens between 10.45am to 11.10am, only where it is safe to do so.
"This is a gesture we have made for several years to commemorate those who lost their lives in conflict since the first World War. This is no different to how we use our sirens at night and in residential areas."