The force has also urged fans to respect coronavirus regulations while watching games. The tournament, postponed last summer due to the pandemic, is set to kick-off on Friday; England play their first game against Croatia on Sunday. The Metropolitan Police is calling for fans to remain aware of any potential attacks in the coming weeks. “The terror threat remains at 'substantial',” said Deputy Assistant Commissioner Laurence Taylor. “This means that an attack is likely and I am asking the public to play their part toward security by remaining vigilant and reporting any suspicious activity or behaviour to stewards, security staff or police officers.”