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Solid-fuel missiles like the Sajjil-2 are more accurate than the liquid fuel missiles of similar range currently possessed by Iran. They are also a concern because they can be fueled in advance and moved or hidden in silos. Iran previously had a solid-fuel missile, the Fateh, with a far shorter range of 120 miles (200 kilometers).

Iran’s arms manufacturing program began during the country’s ruinous 1980-88 war with neighboring Iraq to compensate for a U.S. arms embargo. Since 1992, Iran has produced its own tanks, armored personnel carriers, missiles and a fighter plane. The actual capabilities of the weapons, including the accuracy and range of the country’s homemade missiles, are difficult to ascertain given the secrecy of the Iranian military.