The UK government’s plan for what will happen in the coming days after the death of Queen Elizabeth II is codenamed “Operation London Bridge”.
It's widely expected to include the period of official mourning and details of her state funeral.
The plans were first created in the 1960s and have been updated throughout each year.
Some critical decisions relating to the plan have been made by the Queen herself, although some can only be made by her successor, Charles, the new King.
The phrase "London Bridge is down" was presumed used to communicate the death of the Queen to the UK Prime Minister and key personnel, setting the next phase of the plan into motion.
The royal family are expected to announce details of the queen’s funeral, which traditionally should be held 10 days following her death.
Parliamentary business is likely to be suspended for 10 days and the sovereign’s coffin is suggested will lie in state for three days at the Houses of Parliament.
Qatar's prime minister said on Sunday that efforts to reach a new ceasefire in Gaza have made some progress but an agreement between Israel and Hamas to end the war remains elusive.
A huge blast most likely caused by the explosion of chemical materials killed at least 18 people and injured more than 700 on Saturday at Iran's biggest port, Bandar Abbas, Iranian state media reported.
The UN Refugee Agency (UNHCR) and the UN Office for the Coordination of Humanitarian Affairs (OCHA) have sounded the alarm over severe funding shortfalls that are hindering life-saving humanitarian aid in countries including Nigeria, Burundi, and Colombia.
A number of people were killed and multiple others were injured in Vancouver after a vehicle drove into a crowd at a Filipino street festival in the western Canadian city, police said on Saturday.