Eleven vehicles were seized on Sunday for illegal sand mining at Illupur area in the district.
Sources said the revenue divisional officials of Pudukkottai conducted surprise raids in the Illupur area.
The team found that many vehicles were mining the lake sediment sand from Vasappan lake at Illupur without any valid permit from either the PWD department or the mines and minerals department.
The team seized the sand in one tractor and two tipper lorries filled with sand and six empty tractors and two JCB machines were also impounded. These were handed over to police.