A massive explosion rocked Petronas's Refinery and Petrochemical Integrated Development (Rapid) at the Pengerang Integrated Complex near here, at 1.25am today.
The blast was followed by a huge blaze which could be seen kilometres away, Bernama reported.
It is understood that two Malaysian workers were injured in the incident. The extent of their injuries has yet to be established.
Videos and images of the ensuing fire at the complex have gone viral on social media, with several local netizens claiming to have felt tremors as a result of the explosion.
According to various reports, the fire was doused by about 2.30am.According to Bernama, checks at the complex at 6.30am today found no trace of the fire and that the plant was operating as usual. Buses were seen ferrying workers to the site, and lorries were heading in and out of the complex as per normal.
In confirming the incident, Petronas said its Emergency and Fire Response Team, which was immediately deployed to the scene, managed to the contain the fire within 30 minutes.
"The situation is under control and all the relevant authorities have been informed (of the incident).
"We will provide additional information in due course, as the investigation is still being carried out," it said.