Nato Wales Police's official Twitter page reported ahead of the summit in Newport:
ITV News Wales and West of England Correspondent Rupert Evelyn reports:
Three RNLI lifeboats involved in the search for a child missing in waters off Anglesey have been stood down for the evening, ITV News has been told.
Crews from Porthdinllaen, Holyhead and Trearddur Bay were called to assist with the search at around one o'clock this afternoon.
Coastguards, Sea King rescue helicopters from RAF Valley and North Wales Police have all been scouring the coastline for the boy.
A boy missing in waters off Aberffraw is believed to be part of a family from Yorkshire, who were on holiday on Anglesey.
Our reporter Rob Shelley spoke to one of the men heading up the search this evening.
ITV News understands a child swept out to sea off the coast of Anglesey is a 12-year-old boy.
Holyhead Coastguard received a 999 call earlier this afternoon, reporting that a number of people were stuck on rocks in the estuary.
Further information then suggested that two men had managed to make it back to shore, plus a young boy. However, another youngster was caught in the large waves and swept out to sea.
A lifeboat from Holyhead RNLI has joined the search for a boy missing off the coast of Anglesey.
The operation, which launched at one o'clock this afternoon, now involves three RNLI lifeboats, coastguard teams and an RAF helicopter.
The RNLI says the man and boy were were swept out to sea off Aberffraw, on the west coast of Anglesey.
The man was able to make his way back to shore, but the child is still missing.
Crews searching for a child missing off the coast of Anglesey have described weather conditions as 'rough'.
Both lifeboat stations were requested by HM Coastguard to launch this afternoon after they received reports of two people, a man and a boy, who were swept out to sea off Aberffraw.
Trearddur Bay volunteers launched the Atlantic 85 class lifeboat within three minutes of the pagers sounding at 1pm this afternoon, with Porthdinllaen all-weather lifeboat launching shortly after to assist in the search.
Weather conditions are rough, with very choppy seas.
A major search operation is underway for a child missing in rough waters off the coast of Anglesey.
RNLI lifeboats from Porthdinllaen and Trearddur Bay launched just after one o'clock this afternoon after receiving reports of a man and a boy being swept out to sea off Aberffraw.
An RNLI spokesperson said the child, whose age is currently unconfirmed, is still missing in conditions described as rough with very choppy seas.
The man managed to make his way back to shore.
The search currently involves two RNLI lifeboats, coastguard teams and an RAF helicopter.