SINGAPORE (AP) -- Officials say about 90 workers have been injured, 23 seriously, in an accident at a Singapore shipyard.
The Ministry of Manpower says the accident occurred Monday on a jack-up rig being built by Jurong Shipyard Pte. Ltd.
Jack-up rigs are used for oil exploration and consist of a platform on three or four legs that can be raised or lowered.
A shipyard spokeswoman says the workers were testing the rig but one of the legs failed to operate, causing the rig to tilt to one side.
He says the injured workers were taken to hospitals and 53 were later discharged. One remained in critical condition.
An investigation of the accident is continuing.
Jurong Shipyard is a subsidiary of offshore engineering group Sembcorp Marine Ltd.