Three people were rescued but one remains missing after falling into a 600 sq m sinkhole in central China on Monday night. The sinkhole in the city of Zhengzhou, according to mainland media reports, was caused by heavy rains. A rescue worker at the scene told the Henan Business Daily that at first there was only a small crack in the road surface but, within minutes, it became a sinkhole that swallowed up a huge chunk of the pavement, reported the South China Morning Post. A few passers-by fell into the sinkhole but managed to climb to safety. The sinkhole soon became bigger as more ground gave way, causing four pedestrians - three adults and a child - to fall in. Three vehicles were also swallowed by the sinkhole.