North Korean missiles pose

North Korea missiles 'a serious threat' after new tests

North Korea launched two missiles within hours of each other, with one flying about 400km (250 miles) and reaching an altitude of 1,000km.

A confirmed successful test would mark a step forward for North Korea after four failed launches in recent months.

South Korea, the US and Nato have also expressed alarm over the latest tests.

Both launches are believed to have been intermediate-range Musudan missiles, whose range of about 3,000km is enough to hit South Korea, Japan and the US territory of Guam in the Western Pacific