Police used an explosive device to get into a property to make the arrests.
On May 22 a suicide bomber left 22 people dead after an explosion at Ariana's concert at Manchester Arena.
They also have published CCTV images of Abedi on the night of the attack, which show him wearing a hat, glasses and a dark top.
Only the straps of the rucksack - a bag containing tricyclic acetone peroxide, bolts and nails - are visible in the pictures. According to BBC, May said significant police activity in the last 24 hours led to the decision to reduce the level.
Other members of Manchester bomber Salman Abedi's terror network could still be at large, the Home Secretary has said. "There will be more arrests and there will be more searches", he said.
Eleven people remain in custody after being arrested in connection to the attack.
Georgina Callander's family said the 18-year-old's life had been cut short by "evil, evil men prepared to ruin lives and destroy families". On Wednesday, Tripoli police arrested Abedi's younger brother and father.
Greater Manchester Police said around 1,000 people are involved in the investigation and hundreds of officers are involved in security around Greater Manchester.
He said a group of young Middle Eastern men moved into the address around six months ago. In the aftermath of the bombing, the star shared her deep condolences to the families of the victims and paid tribute to the city.
Adding, "I don't want to go the rest of the year without being able to see and hold and uplift my fans".
"What we are doing is challenging the people who are delivering end-to-end encryption to work with us so that we have a way of keeping people safe", she said.
Manchester is slowly returning to normal, though the damaged arena and adjacent Victoria train station remain closed. Former U.S. President Barack Obama offered his condolences to the victims and support for those wounded in the Manchester bombing during a meeting Saturday with Prince Harry at London's Kensington Palace. The National Health Service says 75 people have been admitted to eight hospitals, "including 23 patients now receiving critical care".
In the wake of the tragedy, Ariana confirmed on Friday that she will to the United Kingdom city to give a concert to raise money for the victims' families, and to visit with survivors and fans. 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 than we did before.
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