HONG KONG, March 29 -- Two Hong Kong construction workers were missing in the sea on Wednesday and three of their colleagues injured in an accident at the construction site of the Hong Kong-Zhuhai-Macao Bridge.

Reports from the scene said three workers fell into the sea around 3:30 p.m. local time, one of whom were rescued.

Two other workers have so far remained missing.

The Government Flying Service and firefighters were scouring the water for the missing.

The other two workers fell on the bridge pier and then were taken to hospital.

The Labour Department of Hong Kong immediately deployed staff to the scene upon receiving a report of the accident and has been conducting an investigation into the cause.