Shillong, Jan. 5: The Meghalaya State Pollution Control Board is awaiting a detailed report from the Central Pollution Control Board on the actual reason behind the contamination of Lukha river in Jaintia Hills, which resulted in the death of many fishes. The Lukha river near the coal mining sites in Jaintia Hills had turned blue several times last year. An official with the pollution board said after the preliminary studies, the samples collected from the river in Jaintia Hills were sent to the Central Pollution Control Board for checking.