North Korea says it has arrested a US citizen for illegally entering its territory across the border from China. The official news agency said the man, who has not been identified, had been detained on Monday and was now being questioned. North Korea is currently holding another US citizen, Robert Park, who crossed a frozen border river from China on 25 December, to make a protest against repression in the hard-line Communist North. <br/><br/>The US has been seeking access to Mr Park through the Swedish embassy in Pyongyang, which represents American interests in North Korea. Last year two US journalists, Laura Ling and Euna Lee, were also arrested on the border with China. They were sentenced to 12 years' hard labour but freed after four months in captivity, as part of a diplomatic mission spearheaded by former US President Bill Clinton in August.<br/>