The 23-year-old was held on suspicion of terror offences at an address in Shoreham-by-Sea in the early hours of Monday morning, Greater Manchester Police (GMP) said.
As counter-terror officers swooped in the desirable seaside town, searches were also launched 260 miles away at properties in Manchester and Cheshire.
With the massive operation to dismantle suicide bomber Salman Abedi’s network showing little sign of slowing:
:: Fourteen men were being held in custody in connection with the Manchester Arena attack.
:: Police remained at an address in Shoreham-on-Sea, one of the country’s most expensive seaside towns.
:: Officers from Cheshire Police and Counter Terrorism Policing North West searched an address in Chester in connection with the attack.
:: GMP said they had also executed a search warrant in the Whalley Range area of south Manchester.
The Bank Holiday raids followed the arrest of a 25-year-old man in Old Trafford and a 19-year-old man in Gorton in connection with attack.