U.S. says aware of seismic activity near known North Korea nuclear test site

WASHINGTON (Reuters) - The White House's National Security Council said on Thursday it was aware of seismic activity on the Korean Peninsula in the vicinity of a known North Korean nuclear test site. "We are monitoring and continuing to assess the situation in close coordination with our regional partners," an NSC statement said. A South Korean government official said the tremor was suspected to be the fifth nuclear test by North Korea, the Yonhap news agency reported. (Reporting by Eric Beech; Editing by Michael Perry)