This undated handout photograph released by Korea's Foreign Ministry on May 10 shows a damaged part of the Korean cargo ship HMM Namu docked at a port in Dubai. [YONHAP]

The weapon used to attack the Korean-operated cargo ship HMM Namu near the Strait of Hormuz on May 4 was a missile, the Korean government told the JoongAng Ilbo on Tuesday.

"The weapon used in the attack has been identified as a missile, not a drone, and the government will make a formal announcement shortly," a senior Democratic Party official said.

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On the question of who carried out the attack, the official said, "It is difficult to see this as the work of any actor other than Iran. Who else would it be?"