A ballistic missile launched by North Korea may have had an "abnormal" flight path and landed near the capital Pyongyang, South Korea's military said.

North Korea launched two ballistic missiles on Monday morning, according to reports from the governments of South Korea, America and Japan.

The missiles, launched at 5:05 a.m. and 5:15 a.m. local time, had two different flight distances, 600 kilometers for the first and 120 kilometers for the second, according to South Korea's Joint Chiefs of Staff (JCS ).

Lee Sung-jun, spokesman for the JCS, said at a briefing that there is a possibility that the second missile launched had an abnormal flight in the early stage.

"If it had exploded during an abnormal flight, there is a possibility that debris may have fallen inland," Lee said, clarifying that an "explosion" is one of many possibilities and that the military is "fully analyzing" possibilities different.

South Korea said the first missile, with a range of 600 kilometers, was a short-range ballistic missile, but Lee would only say the second was "a ballistic missile," leaving open the possibility that it was a new weapon.

According to the JCS, the two missiles were fired northeast from the Changyon-gun area of ​​South Hwanghae province, about 130 kilometers southwest of Pyongyang, but no damage has been confirmed so far.

If the missile exploded after flying 120 kilometers northeast of Changyon-gun, the debris could have landed near Pyongyang, based on the distance traveled from the launch site.

The JCS could not confirm whether there was an explosion near the capital of more than 3 million people.

Last week, North Korea said it successfully conducted a test to deploy multiple warheads from a single-stage motor to a medium- and long-range ballistic missile, marking a milestone in its technology upgrade rocket. South Korea later said the North Korean claim was false.

North and South Korea are technically at war, with an armistice ending the Korean War that divided the peninsula in 1953, but no formal peace treaty has been signed.

Meanwhile, both countries are getting closer to their respective partners. North Korea recently signed a defense deal with Russian President Vladimir Putin, and South Korea is increasing cooperation with Japan and the US. /CNN