UK police say 'large part of network' behind Manchester attack arrested

They said one thread of the inquiry involved pursuing whether Abedi was part of a larger terror cell that included Mohamed Abrini, otherwise known as "the man in the hat", with connections to the Brussels and Paris attacks.

Two other people were taken into custody and then released.

With the official threat level raised to "critical", meaning a further attack could be imminent, troops have been deployed to free up police, and armed officers patrolled trains for the first time in Britain.

Since Monday, police have been performing arrests and conducting raids to crack down on anyone who may have had ties to Abedi. "We won't let hate win", Ariana said, saying she has been thinking of her fans non-stop over the past week.

United States channel ABC News reported that police had found a kind of bomb-making workshop in Abedi's home and he had apparently stockpiled enough chemicals to make additional bombs. Abedi's father was allegedly a member of the al-Qaida-backed Libyan Islamic Fighting group in the 1990s - a claim he denies.

The BBC said Manchester Police hoped to resume normal intelligence relationships soon. A relative, who spoke to The Associated Press on condition of anonymity, said the 22-year-old was driven to extremism after his friend was fatally stabbed last year.

Collomb told France's BFM television that Abedi "grew up in Britain and then suddenly, after a trip to Libya and then likely to Syria, became radicalized and chose to carry out this attack". "Rage was the main reason", for the blast, she said. While Home Secretary Amber Rudd said he was on the radar of the intelligence service "up to a point", it was not clear how much attention officials had paid to his activities and whether authorities could have stopped him.

In the Libyan capital Tripoli, Abedi's younger brother 20-year-old Hashem and their father, Ramadan, were being held by special forces linked to the country's interior ministry.

"Our response to this violence must be to come closer together, to help each other, to love more, to sing louder and to live more kindly and generously then we did before".

22 people lost their lives and many more were seriously injured when a suicide bomber detonated a home-made device at Manchester Arena on May 22.

  • Julie Sanders