- Two men aged 20 and 22 are arrested following a raid, involving a controlled explosion, at an address in Cheatham Hill, north Manchester.
The news website reported: "Ariana Grande's mother was still sitting in her front row seat when the bomb went off, and helped escort some of her panicked young fans backstage".
On Sunday, British Interior Minister Amber Rudd said that members of Manchester suicide bomber Salman Abedi's network are still potentially at large, after the terrorism threat level was lowered due to significant progress in the investigation.
Rudd's comments follow media reports over the weekend that the agency was alerted to Abedi's extremist views before he blew himself up last Monday, killing 22 people after an Ariana Grande concert in Manchester.
A further arrest was made in the investigation into the Manchester bombing on Monday, authorities said, with the detention of a 23-year-old suspect from an address in Shoreham-by-Sea.
Counter-terror police made an arrest in West Sussex in connection to the Manchester suicide bombing.
On Sunday, police released photographs from security cameras showing Abedi on the night of the massacre, wearing jeans and trainers, a black bodywarmer and a baseball cap, with the straps of his backpack visible on his shoulders.
British officials have confirmed he had recently returned from Libya and said police needed information about his movements from May 18 when he returned to Britain. In Rome, Pope Francis led thousands of people in St. Peter's Square in prayer, saying he was "close to the relatives and all those who are weeping for the dead".
Armed police patroled among spectators at the Great Manchester Run, the larged-scale event to take place since the bombing.
"I'll be returning to the incredibly fearless city of Manchester to spend time with my fans and to thank my fellow musicians and friends for reaching out to be a part of our expression of love for Manchester".
Police and security services have said very little about the network believed to be behind Abedi, a Manchester native whose parents had moved to Britain from Libya. "They picked the wrong people to mess with this time".
"It seems likely possible that he wasn't doing this on his own so the intelligence services and the police are pursuing their leads in order to make sure they get all the information that they need to keep us safe", Rudd told BBC Radio, Reuters reported.
The family of one victim, 18-year-old Georgina Callander, said her life had been cut short by "evil, evil men prepared to ruin lives and destroy families".
It brings to 14 the number of people being questioned by police.