The US State Department has said it is aware of reports that a US citizen had been detained in North Korea and it was in touch with the Swedish Embassy in Pyongyang on the issue.
"We are of course aware of the reports that a US citizen was detained in North Korea," a US State Department spokeswoman told a regular news briefing.
"We don't have additional information to share at this time. We have been in touch with the Embassy of Sweden about these reports."
The United States has no diplomatic relations with North Korea and the interests of its citizens in the country are represented by Sweden.
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Matalan said: "It is with great sadness we can confirm...both victims worked at our Cardiff branch."
Police believe a tree currently growing near the farmhouse where the 21-month-old toddler was last seen in 1991 was not there at the time.
The 21-year-old was using a portable toilet in Sydney when he was bitten near to the same area as in a previous incident in April.