We explain Operation London Bridge and Operation Unicorn. ... She reigned over the United Kingdom for 70 years making her Britain’s longest reigning monarch.

According to The Guardian, the phrase “London Bridge is down,” would be said on secure phone lines. On social media, the United Kingdom’s government accounts and its website will display a ...

Christopher Furlong—Getty Images Police operate a cordon on the North side of London Bridge as forensic officers work after Saturday's terrorist attack, on June 4, 2017 in London.