USGS says cannot confirm if N.Korea quake natural or manmade

Undated, Sept 23 :  The US Geological Survey said on Saturday it could not conclusively confirm whether a magnitude 3.5 earthquake detected in North Korea was manmade or natural.
USGS put the epicentre of the quake 22 km (14 miles) east-northeast of Sungjibaegam, North Korea, near the country’s main nuclear test site.
Chinese earthquake officials earlier said the tremor was a “suspected explosion”, while South Korean officials and CTBTO, the nuclear proliferation watchdog, both said they believed it was a natural quake.
(Agencies)