North Korea's military has raised an alert for its artillery units on the west coast in readiness for a planned live-fire drill by the South, Yonhap news agency quoted a government source as saying on Sunday.  "We understand that there's been an upgrade in alert at artillery units," the government source was quoted as saying.                   

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South Korean marines are expected to stage live-fire drills off its Yeonpyeong island off the peninsula's west coast some time before nightfall on Tuesday.