The terror threat level in United Kingdom has been reduced from "critical" to "severe" after temporarily raising the level in response to Manchester Arena attack in which 22 people were killed and several others injured.
The change means that an attack is highly likely and not imminently expected.
British Prime Minister Theresa May on Saturday announced that the terror threat level in the country had been reduced from its top level "critical" to "severe".
London Mayor Sadiq Khan, after Prime Minister May's announcement, had said that security plans will remain in place this and urged all the people to remain vigilant and report anything suspicious to the police.
Earlier, Prime Minister May, after chairing a meeting of the government's emergency Cobra committee, had announced that the country's terror threat level has been raised to its highest level based on evidence gathered during the investigation of the deadly attack at a Manchester Ariana Grande concert.
She said the military personnel will help armed police officers in guarding key sites.
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The Islamic State in Iraq and Syria (ISIS) had claimed responsibility for the attack.
Manchester Police identified the attacker as Salman Abedi, who was killed in the explosion.
He was a son of Libyan immigrants and was born in Britain.
Police have also arrested several people believed to be connected to the bombing.