"After checking additional information, it seems to be unclear whether the vessel was attacked," Wi Sung-lac, South Korea's presidential national security adviser, told a briefing.
He said the ship did not seem to be listing after the fire, which started in the engine room and was extinguished hours later. None of the 24 crew members was injured.
Wi Sung-lac, the South Korean presidential national security adviser, told a press briefing on Wednesday that it was not yet clear if an explosion on a cargo ship operated by South Korean shipper HMM on Monday was caused by an attack.
U.S. President Donald Trump blamed the incident on an Iranian attack, while South Korea's Foreign Ministry said the cause of the fire would only be confirmed after the vessel was towed back to port and inspected.
Wi said the fire on the ship was in the engine room. No one was hurt in the incident.
The South Korean shipper said earlier it had secured a vessel to tow a bulk carrier it operates to a port in Dubai after an explosion and fire damaged the ship, which had been stranded in the Strait of Hormuz.
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