​​Surprisingly, the local civic agency had previously filled around 250 cave-ins and sinkholes in these localities, many of which have now reappeared, as reported by residents. According to BBMP officials, most of the sinkholes and cave-ins on the roads have been caused by seepages from Bangalore Water Supply and Sewerage Board (BWSSB) pipelines and manholes., Bengaluru News, Times Now