The Latest: Obama offers Prince Harry condolences on attack

Police say nothing suspicious has been found at London's Old Vic Theatre after a security alert prompted the evacuation of cast and audience in the middle of a performance.

Theatergoers earlier tweeted that a matinee performance of "Woyzeck" — starring "Star Wars" actor John Boyega — was halted by theater staff and audience and cast were told to leave.

The police force said specialist officers searched the building and found nothing suspicious.

Soccer fans are arriving for the FA Cup final with armed police on the streets outside at Wembley Stadium in London as Britain stages its biggest sporting event since the Manchester suicide bombing.

The 22 people killed in Manchester on Monday night will be remembered in the London stadium Saturday before Arsenal and Chelsea contest the soccer showpiece.

Photos showed police tape cordoning off the area around the theater, near the city's busy Waterloo Station, which handles both trains and the tube.

British Prime Minister Theresa May says the country's threat level from terrorism had been reduced from its top level of "critical," which indicates an attack is imminent.

Police are searching a number of properties and have 11 suspects in custody in connection with Monday's explosion at an Ariana Grande concert in Manchester, which killed 22 people and injured dozens.

Five days after a bomber killed 22 people at a concert in Manchester, more than a thousand armed police are on standby as major events including the Football Association Cup Final and the Premiership Rugby Final are expected to draw tens of thousands of people.