According to the Spanish oil company Cepsa, the oil tanker Hafnia Nile was loaded with naphtha from the energy park of the company in Huelva.

Cepsa received a report from Hafnia, the shipowner of the vessel involved in the collision near the island Pedra Branca on the South China Sea.

We are in constant communication with the shipowners and local authorities, and have offered full support and cooperation.

Cepsa has not commented on the amount or condition of the cargo.

The Hafnia Nile, a 74,000-deadweight-tons capacity Panamax tanker, was carrying about 300,000 barrels of naphtha, according to ship-tracking data from Kpler and LSEG. Naphtha can be used to make petrochemicals.

The cargo was sold by traders to Japan's largest refiner Eneos. Eneos has said that it will not comment on specific transactions.

The Maritime and Port Authority of Singapore reported that the tanker collided with the tanker Ceres I, which was sailing under the flag of Sao Tome and Principe. Both vessels also caught fire. This happened early Friday morning about 55 km (35miles) northeast of Pedra Branca Island in Singapore.

Malaysia's Coast Guard said that on Saturday, the Ceres I supertanker had left the site of the accident. It was also believed that it had turned off its tracking device.