South Korean army soldiers watch a TV news program with a file footage about North Korea's rocket launch at Seoul Railway Station in Seoul, South Korea on Feb. 7, 2016.
Ahn Young-joon—AP
February 8, 2016 7:59 AM EST

Tensions on the Korean peninsula flared again Monday as South Korea fired warning shots at a North Korean patrol boat, one day after Pyongyang provoked international condemnation with a controversial satellite launch.

The South fired the shots and broadcast loudspeaker messages at the Northern vessel after it crossed a maritime boundary known as the Northern Limit Line, an official from the South’s defense ministry said on condition of anonymity.

The Northern vessel crossed the line in the Yellow Sea at around 6:55 a.m. (4:55 p.m. ET Sunday) and retreated about 20 minutes later following the shots and messages, the official added, saying that …

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