India, Sept. 24 -- Taking note of a recent incident in which a forest ranger was killed after being allegedly hit by a dumper while he was trying to stop illegal mining in Rajasthan, the Supreme Court on Wednesday said there should be mandatory preventive detention in these cases.

The matter was mentioned before a bench of Justices Vikram Nath, Augustine George Masih and Sandeep Mehta in a pending suo motu case titled 'In Re: Illegal sand mining in the National Chambal Sanctuary and threat to endangered aquatic wildlife'.

The advocate, who mentioned the matter, said another incident has come to light and a forest officer has been crushed to death by a dumper in Rajasthan. The bench posted the matter for hearing on October 6.

"Come prep...