Once the alarm sounded in the building, the management put procedures into place for the evacuation process.
As we arrived, the commander at the time decided that as a precaution the entire building was to be evacuated and crews quickly worked alongside building management to make sure that occurred.
Evacuating such large numbers of people can impede crews if there is a fire apparent but because it has been practised a number of times and we have worked alongside building management on a number of exercises, it was quite a quick and easy process.
More top news
Muslim leaders condemned the "heinous and appalling" Westminster terror attack.
Travis Frain is recovering in hospital and has posted a photo to Twitter of Prince Charles by his bedside.
Acting Commissioner Craig Mackey led new policemen and women in paying their respects at a passing-out parade in Hendon, north-west London.