The lockdown may have led more individuals to become radicalised as they spend more time online, a British police chief has warned.
The Metropolitan Police's Lucy D'Orsi said the precise impact of the lockdown on the terrorism threat was not yet known.
She urged the public to remain alert as people return to crowded places closed in March.
The current UK threat level is "substantial", meaning an attack is likely.
"The reality is that the threat has not gone away," Met Police Deputy Assistant Commissioner D'Orsi told.
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