He calls on China to provide a level playing field for American businesses as he begins a visit aimed at resolving a raft of contentious issues
The accident occurred at a construction site of the 42-floor Torunlar Center in Sisli's Mecidiyekoy neighbourhood. It was claimed that the elevator was once broken 15 days ago, and that the repair work was awaiting budget funds, Xinhua reported.
Istanbul Governor Huseyin Avni Mutlu said eight officials who were responsible for the accident were taken into custody by the police.
Turkish Prime Minister Ahmet Davutoglu described the workers' deaths "very painful and very saddening".