The NoDong 1 (also RoDong 1) is a single stage, mobile liquid propellant intermediate range ballistic missile (IRBM) developed by North Korea. It is an adaptation of the Soviet SS-1, more commonly known by its NATO reporting name Scud. It is believed North Korea obtained Scud-B designs from Egypt and possibly Scud-C designs from China, and reverse-engineered them into a larger, longer-distance weapon dubbed the NoDong. American reconnaissance satellites first detected this type in May 1990. The precise capabilities and specifications of the missile are unknownVariants called the NoDong 2, NoDong B and NoDong X were believed to have been developed but production was halted in 1996 or 1997, possibly because of a severe economic crisis in North Korea or to focus resources on the more advanced designs. The NoDong-1 remained a lucrative export, however. Libya and Syria are believed to possess NoDong 1 missiles. Variants of the NoDong 1 IRBM are believed to be the basis for the Iranian Shahab 3 and the Pakistani Ghauri missiles.