US President Donald Trump condemned a deadly bomb blast in Manchester, England, as the act of ‘evil losers.’
"The terrorists and extremists, and those who give them aid and comfort, must be driven out from our society forever," said Trump.
The attack came at the end of a pop concert by pop star Ariana Grande at Manchester Arena killing 22 people, including children, and injured 59 others.
Militant group IS has claimed responsibility for the attack.
Greater Manchester chief constable Ian Hopkins said: "This has been the most horrific incident we have had to face in Greater Manchester and one that we all hoped we would never see.
"Families and many young people were out to enjoy a concert at the Manchester Arena and have lost their lives. Our thoughts are with those 22 victims that we now know have died, the 59 people who have been injured and their loved ones."
He said victims were being treated at eight hospitals across Manchester.
"This is a fast-moving investigation and we have significant resources deployed to both the investigation and the visible patrols that people will see across Greater Manchester as they wake up to news of the events last night," he continued.
"This will include armed officers as people would expect. More than 400 officers have been involved in this operation during the night.
"We have been treating this as a terrorist incident and we believe, at this stage, the attack last night was conducted by one man. The priority is to establish whether he was acting alone or as part of a network.
"The attacker, I can confirm, died at the arena. We believe the attacker was carrying an improvised explosive device which he detonated causing this atrocity.
"As people are waking up to this tragic news on what is a sad day for Greater Manchester, the officers and staff from Greater Manchester Police and the other emergency services will continue to do all they can to help get us through the difficult days ahead."
Manchester Airport said flights will operate as normal today but some transport links might be affected.
"Our thoughts and prayers are with all those affected by the terrible events at Manchester Arena," it added on Twitter.
Ariana Grande tweeted: "broken. from the bottom of my heart, i am so so sorry. i don’t have words."
She has reportedly suspended the rest of her UK tour. She was due to play at London’s O2 Arena later this week.
Following the atrocity, the main UK political parties have suspended general election campaigning.
Britain’s Prime Minister Theresa May will chair an emergency meeting in London today.
