South Korean and the United States intelligence points to North Korea allegedly making preparations to begin tests on another intercontinental ballistic missile (ICBM), possibly the Hwasong-17, in April, said government sources to a South Korean domestic media outlet on March 14.

“Though we can’t say definitively when a missile will be launched, we have been keeping close tabs on the possibility,” said an anonymous government source to Yonhap News Agency. They suggest that weather conditions and other variables may alter the schedule of North Korea’s launch. However, according to North Korean Studies Scholar Ahn Chan-il, these tests may happen around April 15, Kim Il Sung’s birthday, as North Korea tends to commemorate important events with military parades or launches.

North Korea is expected to fire its ICBMs from a transporter erector launcher (TEL) at a lower trajectory. This makes detection through spy satellites more difficult compared to ICBMs fired using a launchpad.

The news comes after the two countries claimed that North Korea test-launched ICBMs using its new ICBM system last February 26 and March 5, which were concealed and labeled as reconnaissance satellite development tests when they were actually preliminary launches to test parts of an ICBM. The test launch reportedly did not demonstrate the ICBM range. Furthermore, it was unclear whether the tests used all stages of the missile, although reports have surfaced that only one stage was activated.