Photos and surveillance footage show the worksite where a tunnel collapsed and killed three construction workers in Jinan.Jinan Emergency BureauAuthorities are blaming an intern for a construction firm in China for a tunnel collapse.The intern, Wang Nianpu, is named "mainly responsible" and criminally liable while his bosses face fines.Wang was supposed to deliver an important stop-work order but failed to do so, investigators said.Chinese authorities have named a construction intern as likely criminally responsible for a pipe network collapse that killed three construction workers.Wang Nianpu, an intern working as a quality inspector, was one of three people marked in an investigation report as liable for the collapse in December along a main road in central Jinan City.The report, seen by Business Insider, was filed in early May but went viral after local media reported the case over the weekend.It said the workers were killed in a tunnel that collapsed because a steel support beam was missing.