Deputy Bangkok governor Theerachon Manomaiphiboon blamed this on the contractor hired for the job by the Metropolitan Waterworks Authority (MWA), and set city workers to conduct repairs and fill the hole.
He said at an earlier MWA job, workers did not pump out the water flooding the area before filling it, which later widened a hole underground and weakened the foundation, causing the road to collapse.
The Watthana district office is looking to see if jobs done by the contractor in question, as well as other MWA tasks, were being done after prior approval.