Australian Prime Minister Tony Abbott has said the case of a six-month old baby abandoned by his Australian parents because he had Down's Syndrome is "an incredibly sad story."
He said it was one of the pitfalls of surrogacy and added: "I hate to think that a child could be abandoned like that."
More top news
The storms that struck Texas and Oklahoma late on Tuesday brought tornadoes, tennis ball-sized hail and powerful winds.
Samantha Baldwin, 42, and her sons Louis Madge, nine, and Dylan Madge, six, haven't been seen for two days.
A spokesman for the UK Coastguard said it was coordinating a search operation in the Caernarfon Bay area of North Wales.