The Japanese Coast Guard said the destroyer was experiencing some flooding but was not in danger of sinking, while the merchant vessel was able to sail under its own power.
The U.S. Navy said in a statement the USS Fitzgerald, an Aegis guided missile destroyer, collided with a merchant vessel at about 2:30 a.m. local time, some 56 nautical miles southwest of Yokosuka, a rare incident on a busy waterway.
Three aboard the destroyer had been medically evacuated, including the ship's commanding officer, Cmdr. Bryce Benson, who was reportedly in stable condition after being airlifted to the U.S. Naval Hospital on the Yokosuka base, the Navy said.
The other two injured were transferred to the hospital to treat lacerations and bruises, it said. The Fitzgerald, the Japanese Coast Guard and Maritime Self-Defense Force were searching for the seven missing sailors.
Benson took command of the Fitzgerald on May 13. He had previously commanded a minesweeper based in Sasebo in western Japan.
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