An enquiry conducted by municipal advisor P C Shah held the contractor responsible for the ``lack of supervision and security at the site'', which resulted in the July 28 mishap in which 6 boys drowned in the lake.

Talking to reporters, the commissioner said that after the report was submitted to him, he had taken immediate action. While the zonal chief, assistant commissioner C J Gamit, and executive engineer Nitin Vaidya were transferred, two employees were suspended. The procedure to blacklist the contractor will be initiated, he said, adding that he had already ordered Ukani's payments to be stopped and asked all zonal chiefs to cancel his contracts in other municipal zones.

While Additional City Engineer B M Desai will replace Gamit, K B Khalasi will replace Vaidya, who was looking after the lake development project.

While technical supervisor U N Rameshwala and junior engineer Y C Patel have been suspended, two technical assistants posted at north zone are to face a departmental enquiry, the civic chief said.

The commissioner, however, refused to disclose names of officials he wants to take action against.