SINGAPORE - Part of an oil rig gave way at a Singapore shipyard on Monday injuring 90 workers, one critically and 22 seriously, in one of the more serious workplace accidents in the wealthy Asian city-state.

The accident happened at Jurong Shipyard, owned by Sembcorp Marine Ltd, the world's second-largest rig builder.

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"Preliminary findings indicate that the jackup mechanism of one of the legs of a three-legged jackup rig had failed, causing the rig to tilt to one side," it said. "All work has stopped at the listing rig."

Sembcorp Marine, linked to Singapore state investor Temasek Holdings Pte Ltd, said the accident happened during a test at a rig under construction.

"As investigations are in progress, the company is unable to provide further details at this stage," it said in a statement.