The Manchester bombing inquiry has spread to the south coast of England with the arrest of a man in West Sussex.
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 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-by-Sea.
:: 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 a flurry of police activity in Manchester over the weekend, with the arrest of a 25-year-old man in Old Trafford and a 19-year-old man in Gorton in connection with attack.
Police have been working round-the-clock since Abedi killed 22 people, seven of them children, and injured more than 100 in the worst terrorist atrocity since the July 7 bombings in 2005.
The race to round up a suspected network connected to the terrorist has seen a total of 16 arrests made in connection with the attack, although two people have since been released.
It has been reported that MI5 has launched two urgent inquiries into whether it missed the danger posed by Abedi, 22, amid allegations it was warned of his deadly aspirations.
The domestic security service is said to be investigating whether any glaring errors were made in the handling of intelligence concerning Abedi before he launched the attack last Monday night.
Spy chiefs are believed to have held an emergency review in the days after the atrocity, while a separate in-depth inquiry is being conducted to look at the decision making surrounding his case before the massacre, the Guardian reports.
A senior Whitehall source previously revealed the mass murderer was a "former subject of interest" to the security services whose risk "remained subject to review".
On Sunday Home Secretary Amber Rudd said she would "not rush to conclusions" that agents "somehow missed something".
In the wake of the Manchester attack it emerged that British counter-terror authorities were grappling with 500 investigations into 3,000 individuals.
Security sources later confirmed to the Press Association that a further 20,000 individuals were said to have been considered "subjects of interest" in the past,
It means as many as 23,000 people have appeared on the radar of counter-terror agencies, although the period the figures cover is unclear.
Ms Rudd said MI5 was right to review the way it had dealt with Abedi in the past.
"I think it is the right first step.
"There is a lot of information coming out at the moment about what happened, how this occurred, what people might or might not have known," she told Sky News.
"It is right that MI5 take a look to find out what the facts are.
"We shouldn't rush to a make any conclusions at this stage.
"The important thing at this moment, I believe, is to allow the operation to continue and to conclude."
Police stood guard outside the secluded detached property searched by police after another early morning raid in Whalley Range, Manchester.
Neighbours said the house on Montcliffe Crescent is home to a Libyan family, with a mother and five children, two girls and three boys, the eldest in their 20s, who play for a local football team made up of Libyan nationals.
They are understood to have links on social media with others already under arrest.
The father of the children died around a decade ago.
Locals reported the first police activity around 4.30am but there was no reports of explosions as in previous raids where officers have stormed in homes by blasting the front doors.
Neighbours said officers have since been searching the property.
Local councillor Kevin Boram said he was "shocked" at the arrest in the small seaside town of Shoreham.
He said he believed the man was arrested in a flat above a parade of shops in Brunswick Road in the town centre but did not witness it himself.
"We're a very close-knit community," he said.
"I was very surprised. If anything we were pulled closer together by the Shoreham air crash.
"I'm a bit shocked that we've been associated with Manchester.
"It's a great shame for our community."
But it is not the first time the area has been linked to terror.
The Deghayes family, of Saltdean, have lost three sons who died after they went to fight in Syria, while a fourth son has also travelled to the country to fight against dictator Bashar Assad's government.
The Deghayes brothers are the nephews of Omar Deghayes, who was held by the United States as an enemy combatant at Guantanamo Bay detention camp between 2002 and 2007 after he was arrested in Pakistan.