JOHOR BARU: Most of the oil spill that occurred following the collision of two container vessels in waters off the Johor Port in Pasir Gudang on Tuesday, have drifted into Singapore waters,

State Health and Environment Executive Committee chairman Datuk Ayub Rahmat said, according the Department of Environment's (DOE) observation, Pulau Ubin in Singapore was impacted the most from the spill.

"The collision occurred when the vessel Wan Hai suffered a power failure, causing it to become uncontrollable, and it hit APL Denver's starboard tank No 6, causing the oil spill," said Ayub.

He said DOE is currently carrying out an investigation on the incident.

Pulau Ubin, located on the north east of Singapore, is one of the island republic's last nature retreats and plays host to a significant number of birds, both native and migratory. Only about 100 people live on the island currently.

The extent of the damage the oil spill could have on Pulau Ubin remains unknown for now.

Earlier today, it was reported that the two container vessels, one registered in Singapore while another from Gibraltar, had collided on Tuesday night.

Maritime and Port Authority of Singapore (MPA) in a statement had said that APL Denver reported that one of its bunker tanks sustained damage, causing a spillage of about 300 tonnes of oil.

Both MPA and the Johor Port Authority have deployed vessels to contain the spill and execute cleanup operations.

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Container vessels APL Denver (right) and Wan Hai 301 are docked at Johor's Pasir Gudang Port after their collision in the waters between Malaysia and Singapore, January 4, 2017. Reuters Photo