The government of Fujin City said three workers were killed while another one was badly injured after a trench collapsed in Heilongjiang province, northeast of China, on Friday.

Authorities said the three workers were building a sewage manhole when the collapse of the trench occurred. The cause of the collapse is still being investigated.

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The three workers died on the spot while the other worker was rushed to the hospital where he was declared under stable condition.

Further details about the accident have not been revealed, including the identities of the fatalities.

The incident in Fujin City occurred just just four days after four people died when a high-speed railway tunnel collapsed in Guizhou province.

The tunnel collapsed while workers were finishing the high-speed railway tunnel on time.

The tunnel is part of the high-speed railway line that connects China’s Shanghai and Yunnan Province’s capital Kunming, a major component of the Chinese government’s efforts to construct more high-speed railway lines to speed up the flow of goods within the country.

On May, six workers were killed and two others slightly injured after a collapse in a tunnel under construction in east China's Anhui Province, local authorities said.

The accident happened at about 12:53 a.m. in the tunnel that is being built for a highway bridge across the Yangtze River near Dongzhi County of Chizhou City, a county government spokesman said.

The Chinese government has unveiled the longest railway tunnel in northwest China, the 22.449-kilometer left part of the Zhongtianshan Tunnel. The tunnel is the longest of its kind in Xinjiang Uygur Autonomous Region.

The Urumqi Railway Bureau (URB) said the tunnel, constructed by the URB and the 18 Bureau Group Co, is also the third-longest in the country. It took about seven years to complete the entire tunnel, the URB said.

TagsChina Accident, China Trench Collapse