North Korea has fired an "unidentified projectile," according to South Korea's military.

The projectile was fired from Pukchang in south Pyongan province, the Joint Chiefs of Staff said in a statement reported by the Yonhap news agency.

The area, which is the location of a military airport, is north of the capital Pyongyang.

It was not believed to be a intercontinental ballistic missile, an anonymous military source told Yonhap.

The launch comes a day after North Korea said the US was within strike range and claimed it has "all kinds of powerful means for annihilating retaliatory strikes."

Earlier this month, North Korea launched a medium long-range ballistic missile called the Hwasong-12, which it said was capable of carrying a heavy nuclear warhead.

That missile - which was launched from a site in Kusong, North Pyongan - flew for about 30 minutes, travelling about 500 miles (800km) before landing in the Sea of Japan, according to Tokyo.

North Korea regularly tests short-range missiles, but it is also said to be working to master the technology needed to field nuclear-tipped missiles that can reach the US mainland.

The launch of the Hwasong-12 was the 10th test this year.