An Ariana Grande concert in Manchester, England ended with explosions and a mass emergency evacuation, according to Greater Manchester Police Department.

UPDATE: NBC News reports that the at least 19 people were killed, and about 120 more people were injured. British Prime Minister Theresa May has called the incident “an appalling suicide attack.”

Reportedly, the first of two explosions happened around 10:40 p.m., after the final song of Grande’s performance. From there, according to tweets by and interviews with attendees, concertgoers were screaming and running to the exits.

British and U.S. law enforcement officials believe they have tentatively identified the bomber through forensic evidence, including a body found at the site, according to NBC News. Some of the casualties may have been from the stampede of concertgoers, while others from the explosion itself.

Ariana Grande has tweeted about the attack as well.

“broken. from the bottom of my heart, i am so so sorry,” she tweeted. “i don’t have words.”

Scooter Braun, Grande’s manager, also released a statement thanking “Manchester’s first responders, who rushed towards danger to help save lives,” and to ask everyone to “hold the victims, their families, and all those affected in your hearts and prayers.”

This is an ongoing story.