A total of eight people are now in custody after two men were apprehended by Greater Manchester authorities in connection with the Arena bombing.
One of the men was arrested in an unknown part of the county, while counter-terror police arrested the other at an address in Withington.
This follows a series of raids on Wednesday across Wigan, Warwickshire, Nuneaton, and Manchester as police continue to track down members of a suspected "terror network".
Greater Manchester Police Chief Constable Ian Hopkins has publicly stated it appears clear such a network was in place.
The suicide bomber behind Monday's attack, Salman Abedi, was suspected of being a member of the cell, and several of his family members have been arrested in Libya as the investigation continues.
A 23-year-old man was arrested in Manchester on Tuesday, and several reports have named him as the bomber's older brother Ismail.
Authorities continue to delve into Abedi's background as the UK remains on 'critical' alert.