UK police said Friday officers had carried out a controlled explosion after “a suspicious package” was found outside the United States embassy in London.

The capital’s Metropolitan Police force conducted the explosion after setting up cordons near the high-security site in Nine Elms, just south of the River Thames.

“We can confirm that the ‘loud bang’ reported in the area a short time ago was a controlled explosion carried out by officers,” the force said in a post on X.

“Enquiries are still ongoing and cordons will remain in place for the time being.”

The US embassy said in a post on its X account that local authorities were investigating “a suspicious package” outside the building.

It added that police had closed a nearby road “out of an abundance of caution”.