"North Korea should exercise self-restraint in making provocative acts," Chief Cabinet Secretary Yoshihide Suga told a news conference.
South Korea fired a barrage of artillery rounds into North Korea on Thursday after the North shelled across the border to protest against anti-Pyongyang propaganda broadcasts by Seoul. (Reporting by Kaori Kaneko; Editing by Dean Yates)Japan says has strong concerns over North Korea's 'provocative acts'
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