Home Minister Rajnath Singh said the multi-pronged strategy being implemented by the Centre is helping in addressing the problem and maximum possible assistance is being provided to the affected states.
There are incidents of extortion and killing in naxal-affected areas, he said while replying to questions.
Minister of State for Home Affairs Haribhai Parathibhai Chaudhary said the government would work in a "mission mode" to address the problem and end naxalism.
In 2015, 168 civilians and 58 security personnel were killed whereas 720 civilians and 285 security personnel died in 2010, Singh said.
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There were 2,230 incidents related to naxals and Maoists in 2010, he added.
"According to reports, Left Wing Extremists groups, particularly the CPI (Maoist), reportedly resort to extortion from industrialists, businessmen and contractors," Chaudhary said.
The details of cases of extortion by LWE groups and the number of persons arrested/killed in the cases of abductions and extortions are not centrally maintained, he added.
Up to February 29 this year, there have been 24 attacks on economic targets by LWE groups.
The quantum of damage to economic infrastructure and persons arrested in these incidents are not centrally maintained, Chaudhary said.
"The central government closely monitors the situation and has a multi-pronged strategy towards combating LWE including security related measures; development related interventions; and ensuring rights and entitlements of local communities," he noted.