The new arrests came as the injured toll doubled from 59 to 119.
Anil Velji leaped into action when the raider burst into his convenience store in Oldham, Greater Manchester.
European soccer body UEFA opened disciplinary proceedings against Manchester United and Liverpool on Friday after fans clashed and threw objects during a Europa League tie at Old Trafford.
A British fighter jet was on Tuesday scrambled to escort a Qatar Airways plane carrying 282 people to Manchester airport after reports of a possible device on the aircraft emerged, as police arrested a passenger on suspicion of making a hoax bomb threat.
Britain fell silent on Thursday as a minute's silence was held across the country to remember the 22 victims of Monday's concert bombing. The silence, which fell at 11 am, also marked the nation's solidarity with the 119 who were injured in the blast at the Manchester Arena following a concert, as well as others affected by the atrocity. Crowds gathered at well-known sites in the UK, including London's Parliament and Trafalgar Square. Here are some touching glimpses...
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Eyewitnesses reported hearing a loud "bang" from inside the venue.
A suspicious package destroyed by a bomb disposal team after prompting the evacuation of Manchester United's stadium on Sunday was a fake device accidentally left behind after a training exercise, police said.
He was arrested by Swiss authorities for trespassing at the event in July 2015 but later released.
The United fans, who celebrated the victory at the end of the game with the manager and players, have not been the source of criticism of Solskjaer -- indeed the Norwegian has enjoyed strong backing from supporters who attend games at Old Trafford and those who travel away.
Tyson Fury has been provoking fury well beyond the ring with his pronouncements on homosexuality, women, fellow athletes and a range of other topics.
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Manchester City midfielder Yaya Toure has said the abuse he suffered on social media is 'a disgrace' and called for world soccer's governing body FIFA to reassess the way they deal with racism.
British PM Theresa May said the threat level in the country will remain at critical and that 1,000 army troops have been deployed to boost security.