给定一篇新闻文章，将其编辑为 500 字以内的简短版本。


文章：“The United States launched an airstrike on an Iranian military base in response to the killing of an American contractor in Iraq. The Secretary of State condemned the attack on the contractor and called for an end to Iranian aggression in the region. Iran vowed to retaliate against the United States for the airstrike.”
The US launched an airstrike on an Iranian base after an American contractor was killed in Iraq. The Secretary of State denounced the attack and called for an end to Iranian aggression in the region. Iran has vowed to retaliate.