Authorities looking into Manchester attack

British Prime Minister Theresa May has said that police and security services were looking into whether others were involved in a suicide bomb attack which killed 22 people in the northern English city of Manchester.

British police said earlier that they had arrested a 23-year old man in connection with the attack at an Ariana Grande concert at the 21,000-capacity Manchester Arena.

"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," May told BBC Television.

May said the authorities will be looking at the security of venues to ensure public safety ahead of summer events including this weekend's FA Cup final at Wembley between Chelsea and Arsenal and the English rugby premiership decider at Twickenham.