Preliminary investigations showed the mechanics were working on the evlevator on the 25th floor of the Saeng Thong Thani building, where Citibank has its Thai headquarters, when it suddenly plunged to the basement, said Major Archawin Boonthamcharoen, of Thung Mahamek police station said.

Witness Kriengkrai Meesaeng said all four mechanics worked for the Hitachi maintenance team.

He said after using a sling to suspend the lift, the three victims were on its roof without safety ropes while the only survivor, Thani Khamhom, was inside.

Ktiendkrai said Thani managed to throw himself out but his right arm was trapped by the falling lift.

Police investigations are continuing.

The Nation