“The railway-borne missile system serves as an efficient counter-strike means capable of dealing a harsh multi-concurrent blow to the threat-posing forces,” said Marshal Pak Jong Chon, who also serves as a member of the Presidium of the Politburo of the ruling Workers’ Party of Korea. He oversaw Wednesday’s missile launch test, according to KCNA.

Unconfirmed photos purporting to show the launch have circulated online, with a projectile seen blasting off from a railcar in an unidentified location.

The launch comes after Pyongyang said it successfully tested a new long-range cruise missile earlier this week, which reportedly traveled some 1,500km (930 miles) before hitting a target in North Korea’s territorial waters. Washington denounced the launch, claiming it showed that the country poses a threat to “its neighbors and the international community,” while Tokyo said it was “concerned” over the reported test.

The latest launch marks North Korea’s fifth major weapons test so far this year, according to Yonhap News.