Iraqi security sources say at least five rockets were launched from the town of Zummar towards a U.S. military base in north-eastern Syria on Sunday.
伊拉克安全部门表示，周日，至少有5枚火箭弹从祖玛尔镇向叙利亚东北部的美军基地发射。

This is the first since early February, when Iranian-backed groups in Iraq stopped their attacks against U.S. troops.
这是自2月初以来的第一次，当时伊朗支持的伊拉克组织停止了对美军的袭击。

It also came just one day after the Iraqi prime minister returned from a visit to the United States and met with President Joe Biden at the White House.
就在一天前，伊拉克总理刚刚结束对美国的访问，并在白宫会见了美国总统拜登。

There has been no response from Washington.
华盛顿没有对此作出回应。