Ivanka Trump earlier Tuesday expressed her condolences for the victims of an attack Monday on a Manchester, England, concert venue.

"We stand united with our friends in the UK, and our hearts and prayers are with the victims of this atrocious violence. #RoomForManchester," Trump tweeted.

We stand united with our friends in the UK, and our hearts and prayers are with the victims of this atrocious violence. #RoomForManchester — Ivanka Trump (@IvankaTrump) May 23, 2017

The attack killed at least 22 people and wounded many more.

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The explosion was first reported at about 10:30 p.m. at the end of an Ariana Grande concert.

At a press conference late Monday, Greater Manchester Police Chief Constable Ian Hopkins said authorities are working with national agencies and intelligence officials following the incident.

He said police "are currently treating this as a terrorist incident until we have further information" and said authorities are coordinating with the "national counterterrorism policing network and U.K. intelligence partners."

President Trump also expressed his condolences to those killed and injured in the attack, saying it was carried out by "evil losers."