On March 22, a man drove a rented car into pedestrians on Westminster Bridge in London and stabbed a police officer guarding the British parliament to death before being shot dead.
Five people were killed in the attack.
On May 22, a suicide bomber blew himself up outside a pop concert in Manchester, killing 22 people.
And on June 3, three militants wearing fake suicide vests ran over pedestrians and went on a stabbing spree in bars in the London Bridge area. They killed eight people before being shot dead by police.
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