British Prime Minister Theresa May has said that the police and security services were looking into whether others were involved in the Manchester suicide bomb attack.
Speaking to the BBC, Mrs May said: "I’ve been talking to the police about the investigation that is continuing, and they and the security services are working, obviously, to identify whether there was a wider group of people involved in this particular incident."
Mrs May said the authorities will be looking at the security of venues to ensure public safety ahead of summer events.
Scotland Yard has said that extra armed police officers will be deployed at Wembley for this weekend's FA Cup Final and at Twickenham for the Aviva Premiership final.
Earlier, Mrs May said that the attack was one of the worst terrorist incidents ever experienced in the UK.
Following an emergency cabinet meeting at Downing Street, she said that while all acts of terrorism are cowardly this one stands out for its appalling, sickening cowardice.
All acts of terrorism are cowardly attacks but this attack stands out for its appalling, sickening cowardice - Theresa May pic.twitter.com/s9HY4u2x4Z
— RTÉ News (@rtenews) May 23, 2017
She confirmed that as well as the attacker, 22 people are dead and 59 injured.
She said that many of these injuries are life threatening and that children and young people are among the dead.
Injured people are being treated across 8 hospitals in the greater Manchester area, many for life threatening injuries - Theresa May pic.twitter.com/TBaJmJyliC
— RTÉ News (@rtenews) May 23, 2017
Police believe the attack was carried out by one man but now need to find out if he was acting alone or part of a wider group - Theresa May pic.twitter.com/st5zSVEf01
— RTÉ News (@rtenews) May 23, 2017
A suicide bomber deliberately chose the place where he could cause "maximum carnage" when he detonated a bomb at a pop concert in Manchester, Mrs May said.
Read Theresa May's statement in full
She confirmed that police and security services believe they know the identity of the man responsible and are now working to establish whether he was acting alone or as part of a group.
Mrs May condemned the "cowardice" of the attacker and hailed those who rushed to help, who had shown "the spirit of Britain ... a spirit that through years of conflict and terrorism has never been broken and will never be broken".
The terrorists will never win and our values, our country and our way of life will always prevail.
