SEOUL, South Korea — North Korea launched two short-range ballistic missiles on Thursday, the South Korean military said, an escalation from the North’s most recent weapons test just five days ago.

The two missiles were launched eastward from the country’s northwest, with one flying 260 miles and the other about 170 miles, the military said in a statement. It said officials from the South and the United States were jointly analyzing flight data to determine what type of missiles they were.

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The South Korean military first said the missiles were fired from Sino-ri, home to a North Korean ballistic missile base. But it later amended that, saying they had been launched from Kusong, a town north of Sino-ri.