South Korean marines arrive at a port on Baengnyeongdo, an island near the border with North Korea April 1, 2014. An unmanned drone crashed on a South Korean island near a disputed maritime border ... more 
South Korean marines arrive at a port on Baengnyeongdo, an island near the border with North Korea April 1, 2014. An unmanned drone crashed on a South Korean island near a disputed maritime border with North Korea, a South Korean defense ministry official said on Tuesday, triggering an investigation into whether the aircraft was from the North. The drone fell on Baengnyeong island at about 4 p.m. on Monday, when North Korea fired hundreds of artillery rounds in seas close to a disputed maritime line. That triggered a similar show of strength from South Korea in response., Japan and the United States pledged to curb its nuclear arms ambitions. REUTERS/Hong Hae-in/Yonhap (SOUTH KOREA - Tags: POLITICS MILITARY) ATTENTION EDITORS - NO SALES. NO ARCHIVES. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA less 
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Reuters | Photo By YONHAP / REUTERS
Tue, Apr 1, 2014 3:14 AM EDT