It is understood that the UK has not arrested the teenager.
A Government source said there was “always the possibility” the US could put in an extradition request, but would not confirm if one had been made.
However Professor Alan Woodward, a cyber-security expert at Surrey University, said that if he were Mr Sheppard he “would be slightly worried”.
“The Americans will issue a legal assistance warrant,” he said.
“In this case, they did actually not just break in, but they then tried to use it for a criminal scam. They walked away with thousands of pounds. So you know, this, they were not trivial sums of money. I suspect that the British law enforcement agencies will not have a great deal of sympathy with them.”
According to neighbours, Mr Sheppard – who attended a local state comprehensive school – is “a nice lad” whose father, Mark, passed away around five years ago.
They added that his mother, Lorraine, had been bringing him up since her husband died.
A woman in…