North Korea has fired what has been described as an unidentified projectile into the sea, said South Korea’s Joint Chiefs of Staff (JCS), the BBC reports.
The Japanese coast guard, which first reported the launch, said it could potentially be a ballistic missile, but no confirmation has yet been given.
The UN prohibits North Korea from ballistic and nuclear weapons tests.
If confirmed, this would be the first such launch carried by Pyongyang this year.
“South Korean and US intelligence are closely analysing for further detail,” the JCS said in a statement.
Japan’s defence minister Nobuo Kishi said the suspected ballistic missile had flown about 500 km, according to a Reuters report, but according to one expert, there is still no way to confirm this.