The 7 July 2005 London bombings were a series of suicide attacks carried out by homegrown terrorists on London's public transport network during the morning rush hour. The bombings, three on the London Underground and one on a bus, killed 52 people and prompted a massive response from the emergency services, and in the immediate aftermath the almost-complete shut down of the city's transport system. Over the following hours and days there were several security alerts throughout the United Kingdom, and in some foreign cities. London largely returned to normality in the following days, though with several further security alerts and a reduced service on the Underground.