Railway bridge in peril

A few days ago I travelled from Chittagong to Dhaka by train. On the way, to my horror, I found that sand/earth being extracted from a canal using extractor, and the place of extraction is extremely near to the pillars of the railway bridge over the canal. The bridge is the one next to the Gomoti bridge towards Dhaka. The extracted sand/earth is being used for earth filling in the existing railway line to lay a new track. Extracting sand/earth from so near to the railway bridge will put that bridge in danger of collapsing. I would like to draw the attention of the authorities to this matter.