DUBAI — Iran said Saturday that it had successfully tested a new ballistic missile with a range of 2,000 kilometers, or about 1,200 miles, and would keep developing its arsenal despite pressure by the United States.

The United States has imposed unilateral sanctions on Iran, saying its tests violate a United Nations resolution that calls on the country not to undertake activities related to missiles capable of delivering nuclear weapons. Iran says it has no such plans.

Iran said in its announcement on Saturday that the missile could carry several warheads.

The state broadcaster IRIB showed footage of the missile test without giving its time and location. It included video from an onboard camera, which the broadcaster said showed the detachment of the cone that carries multiple warheads.

“You are seeing images of the successful test of the Khorramshahr ballistic missile with a range of 2,000 kilometers, the latest missile of our country,” IRIB said, adding that this was Iran’s third missile with such range.