New Delhi: Former BJP President Rajnath Singh on Saturday wrote to Prime Minister Manmohan Singh demanding that the government take a "proactive" stand on the reported diversion of Brahmaputra waters by China and enter into a treaty with Beijing for sharing the river waters.

In his letter, Rajnath Singh has expressed concern over the drying up of almost a kilometre of Brahmaputra stretch at Pasighat in Arunachal Pradesh and affected parts of Assam and the North-East.

This has reportedly happened due to damming by China, he said.

"It has been reported that China is building a USD 62 billion project and damming Brahmaputra on the Indo-Tibetan side by constructing 28 dams," he said.

The BJP leader requested the Prime Minister for a "proactive response" without any further delay. "Ignoring this issue might prove suicidal for India's interest," he wrote.

He has also suggested involving Bangladesh on this issue as it is also affected by the reported diversion of water.

"There is an urgent need to persuade China to make it agree for a joint inspection on the Indo-Tibetan side of the Brahmaputra river to ascertain the actual situation on the ground. We should also enter into an International Water Treaty with China as regards the Brahmaputra river and allied issues," he said.

Singh has suggested that the pact could be on the lines of the Indus Water Treaty between India and Pakistan.