Iran’s revenge for the killing of a top military official came early Wednesday as the country launched ballistic missiles at two U.S. military bases in northern Iraq.

The attack Wednesday was launched to avenge the killing by the United States of Revolutionary Guard Gen. Qassem Soleimani, a top Iranian military leader. According to the Department of Defense and various media reports, ballistic missiles were used in the attack.

What is a ballistic missile and which bases were targeted? Here’s a look at what happened.

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