State television said the powerful Revolutionary Guard, which controls Iran's missile program, successfully tested upgraded versions of the medium-range Shahab-3 and Sajjil missiles with can fly up to 1,200 miles (2,000 kilometers). It was the third and final round of missile tests in two days of drills by the Guard.

The Sajjil-2 missile is Iran's most advanced two-stage surface-to-surface missile and is powered entirely by solid-fuel while the older Shahab-3 uses a combination of solid and liquid fuel in its most advanced form, which is also known as the Qadr-F1.

Solid fuel is seen as a technological breakthrough for any missile program as solid fuel increases the accuracy of missiles in reaching targets.

The war games come at a time when Iran is under intense international pressure to fully disclose its nuclear activities. They began Sunday, two days after the U.S. and its allies disclosed that Iran had been secretly developing an underground uranium enrichment facility and warned the country it must open the site to international inspection or face harsher international sanctions.

Gen. Hossein Salami, head of the Revolutionary Guard Air Force, said Sunday the drills were meant to show Tehran is prepared to crush any military threat from another country