North Korea appears to have unveiled a new type of submarine-launched ballistic missile(SLBM) during a recent military parade.

The North's official Korean Central News Agency(KCNA) on Friday disclosed photos showing what appears to be SLBMs carried by transporters. 

The missiles were labeled "Pukguksong-5ㅅ," indicating that they are possibly the upgraded version of  "Pukguksong-4ㅅ" showcased in the previous military parade in October last year.

The KCNA described the new missile as the "world's most powerful" weapon and submarine-launched ballistic missile, saying that it powerfully demonstrated the might of the North's revolutionary armed forces. 

However, an intercontinental ballistic missile was not seen in the photos. 

The military parade took place on Thursday night at Kim Il-sung Square in central Pyongyang after the North wrapped up its eight-day congress of the ruling Workers' Party on Tuesday.