HANOI, March 26 -- Dozens were killed and injured in an incident in Formosa Ha Tinh Steel Corporation (FHS) construction site in central Vietnam on Wednesday night, Vietnam's state-run news agency VNA reported Thursday.

At around 20:00 p.m. (GMT 1300) on Wednesday, a scaffold collapsed in Vung Ang port construction site, part of FHS huge iron and steel project in Ky Anh district, Ha Tinh Province, some 350 km south of capital Hanoi.

According to initial information, 12 have been killed while more than 20 injured people were rushed to local hospital for emergency treatment, VNA said.

Sources with FHS construction told Xinhua that 14 have been killed, some 30 have been sent to hospitals while some 100 workers trapped in the wreckage are to be evacuated from the site.

The accident occurred when hundreds of workers were working on scaffolds with a height of about 20 to 30 meters at the Vung Ang port under construction by South Korea's Sam Sung Group.

Sources in Ha Tinh also told Xinhua hundreds of Vietnam's border security forces are seen rushing to the accident site, which showed "rescue is going on but more casualties feared".