Hashem Abedi, 20, was arrested with his father, Ramadan Wednesday in the Libyan capital of Tripoli.
On Manchester's Curry Mile and in its mosques, people are wondering how terror came to their city.
Manchester police said they have made three additional arrests in connection to the bombing that killed 22 people.
Abedi blew himself up with an improvised explosive device, killing 22 after an Ariana Grande concert.
"it just doesn't feel real." Hundreds gathered for a vigil to remember the 22 victims of Monday's attack.