As of early 2017 , the phrase " London Bridge is down " was expected to be used to announce the death of the Queen to the Prime Minister and key personnel , setting the plan into motion . Whether this phrase is still the designated one , after the June 2017 London Bridge attack , or after the fact that the code word is now publicly known , has not been confirmed . Neither is it publicly known when this code phrase was originally chosen
2017 London Bridge attack
2017 London Bridge attack
Operation London Bridge