The U.S. struck another alleged drug vessel Tuesday night, this time on the Pacific side of South America, according to two U.S. officials.

In what is the eighth known U.S. attack on a boat since Sept. 2, two to three individuals aboard the vessel were killed. The other seven strikes targeted vessels in the Caribbean.

Democratic Sen. Mark Kelly of Arizona said Sunday on "Face the Nation with Margaret Brennan," "We want to keep fentanyl out of the United States, ... but those routes through the Caribbean on boats are predominantly used to bring cocaine to Europe," not to the U.S. And fentanyl tends to be transported to to the U.S. "from a different way," Kelly added.

The Pentagon has not yet responded to a request for information about the nationalities of the individuals on the boat

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