May 15 (UPI) -- Indian security forces have killed 31 alleged Maoist rebels in what it Modi government officials called "the biggest-ever operation against Naxalism."

The nearly three dozen accused rebels were killed during a 21-day operation in central India's Kurraguttalu Hill region along the Chhattisgarh and Telangana state borders, Union Home Minister and Minister of Cooperation Shri Amit Shah said Wednesday in a statement on X.

"The mountain that was once ruled by red terror is now proudly flying the national flag," Shah said.

Naxalism is a communist insurgency of oppressed peasants that was founded in 1967 against feudal landowners in Naxalbari, West Bengal. India has been fighting the insurgency ever since, and the government of Prime Minister Narendra Modi has vowed to be "Naxal-free" by March 31 of next year.

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