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Police said a “serious incident” and “a number” of fatalities were reported at Manchester Arena in the U.K. on Monday night, where Ariana Grande performed a concert, PEOPLE confirms.

“Emergency services responding to serious incident at Manchester Arena. Avoid the area,” police tweeted about 11:30 p.m. local time. “More details will follow as soon as available.”

In a statement, police said there were “a number of confirmed fatalities and others injured.”

Local authorities could not immediately be reached for further comment and the exact timing of the incident was unclear, whether it occurred during or after the official performance.

“Ariana is okay,” a rep for Grande said in a statement to PEOPLE. “We are further investigating what happened.”

The nature of the incident and the exact number of casualties were not immediately clear, though reports swirled on social media about some kind of large and very loud noise at or near the arena during the concert.

Manchester police said an explosion had been reported.

Witnesses described it as a “huge bang,” according to the BBC.

One video shared on Twitter appeared to show the venue in the aftermath of the incident, with people screaming and streaming to the exits.


This is a breaking news story. Please return for updates.

This Story Originally Appeared On People