hywel griffith reports. alex sigley has been living in pyongyang since last year. developed a bit of a side business offering foreign visitors to north korea tours around the country. according to pictures on his website and social media stream, he's been quite successful in showing everyday life as it is in north korea, sometimes in very mundane detail — things like trips to the zoo or meals that he's enjoyed. he is, according to some people, who have been on those tours, very, very cautious and clear and careful to give respect to his north korean hosts. that stream of twitter messages are stopped two days ago on the 24th ofjune. according to his family in perth, australia, that is unusual for him not to be in daily contact so clearly they are concerned. the australian government say they are urgently trying to work out his whereabouts, but they don't have an embassy in north korea so they are depending on a consular agreement with the swedish embassy, so work is going on behind the scenes to ascertain his whereabouts. there are some unconfirmed reports that he h