Around 90 minutes before the bomb was detonated the IRA had sent a telephone warning into a local radio station. Approximately 80,000 people were evacuated from the area to multiple safe points across the city. This has been called one of the most 'extraordinary policing operations' in the UK. With the bomb squad unable to defuse the bomb before it detonated, the explosion ripped corporation street to pieces, shattering windows throughout the city and causing huge amounts of destruction. More than 200 people were injured however there were no fatalities. The bomb was the biggest mainland bomb to explode in Britain since WWII.