Manchester attack: Police arrest man in Shoreham-by-Sea as probe into arena atrocity continues

Police investigating the Manchester bombing have arrested a 23-year-old man on the south coast on suspicion of terror offences.

The man was held after a raid at an address in Shoreham-by-Sea, West Sussex, 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.

Fourteen men are being held in custody with the massive operation to dismantle suicide bomber Salman Abedi's network showing little sign of slowing.

On Monday morning, police remained at the property in Shoreham-on-Sea, one of the country's most expensive seaside towns.

Officers from Cheshire Police and Counter Terrorism Policing North West also searched an address in Chester in connection with the attack.

And police 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.

Additional reporting by the Press Association.