Two boys have died in a fire at a flat in a village on Anglesey, firefighters said.
One man was treated in hospital for minor injuries
North Wales Fire Service were called to the blaze in Llanfaethlu near Holyhead at 0130 BST on Saturday.
It is reported that a man, believed to be the boys' father, managed to escape and alert emergency services. The boys' bodies were found by firefighters.
A fire investigation has been launched and the first-floor flat above a shop has been cordoned off.
Dai Roberts, of North Wales Fire Service, said when they arrived they were told there were believed to be people inside.
"Tragically, what we located and recovered turned out to be the bodies of two boys," said Mr Roberts.
"Investigations have begun in conjunction with North Wales Police. That could take most of today and into tomorrow."
He added: "It's very tragic for our crews and tragic in itself to lose life in a fire. The loss of life of two boys in a fire is 100 times worse."
North Wales Police said a post mortem examination of the two boys was taking place.
One neighbour Nancy Cunliffe said: "Absolutely dreadful - the worst thing, isn't it, that can happen to children."