The Latest on tensions between North and South Korea following Pyongyang's rocket launch (all times local):

6:05 p.m.

South Korea's Yonhap news agency says the military buildup along the western portion of the border with North Korea is a measure to counter any provocation from its rival.

The report didn't elaborate.

The Defense Ministry says it cannot confirm the report, which cited an unidentified military official.

The reported military buildup Thursday came after the North Korean decision to expel South Koreans from a joint factory park.

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6 p.m.

South Korea's Yonhap news agency is reporting that South Korea has bolstered military readiness along the western portion of the Koreas' border after the North Korean decision to expel South Koreans from a joint factory park.

Seoul's Defense Ministry says it cannot confirm the report, which cited an unidentified military official.

The report gave no other details.

North Korea also said Thursday it was also pulling all its workers from the Kaesong complex just across the tense border in response to the South's suspension of operations there following North Korea's long-range rocket launch on Sunday.

The North further said it was shutting down two crucial cross-border communications hotlines.