Premiers from the world's leading economic powers will renew pressure on Russia to act over the crisis in Ukraine at a summit in Brussels.
Leaders of the G7 group of economic powers will also try to thrash out the outline of an agreement over tackling the threat from terror posed by the Syrian conflict.
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Police would face "real challenges" tackling a repeat of the London riots after years of cuts, one of Britain's most senior officers warns.
Here are the buildings we know are affected and what action is being taken by local authorities.
During an appearance at Glastonbury, the actor asked: "When was the last time an actor assassinated a president ... maybe it's time."