Manchester Bombing: Three more arrested in attack at Ariana Grande concert arena
The arrests came a day after police arrested a 23-year-old man in South Manchester, alleged to be tied to the attack.
The attack was carried out by Salman Abedi, a 22-year-old British national of Libyan descent, who died after detonating the bomb.
The Islamic State claimed responsibility for the attack. However, police are still determining whether Abedi acted alone as they assess the threat of another attack.