Along with firearms, the armed forces' personnel use satellite phones, unmanned aerial vehicles and Air Force helicopters. In 2011, the Indian Army while denying its direct role in the offensive operations accepted that it has been training the paramilitary personnel to fight against the Maoists, however, the Maoists have objected to the Army's stationing in the Red corridor. On 30 May 2013, the Indian Air Force's Air Chief Marshal declared that apart from the currently operating MI-17 helicopters, the Indian Force has decided to induce a unit of MI-17V5 helicopters to "provide full support to anti-Naxal operations." In August 2014, the Ministry of Home Affairs had stated that 2,000 personnel from the Nagaland's Indian Reserve Battalions (IRB) were deployed in counter-insurgency and counter-terrorism operations against the Maoists in Bastar. Since the start of the operation: 2,266 Maoist militants have been killed, 10,181 have been arrested and 9,714 have surrendered. Notable attacks On 12 June 2009, at least 29 members of the Indian Police were killed in an ambush attack by Maoist rebels in Rajnandgaon, 90 km (56 mi) from Raipur (India's Chhattisgarh state). On 15 February 2010, several of the guerrilla commanders of CPI (Maoist), all of whom are believed to be female, killed 24 personnel of the Eastern Frontier Rifles at Silda in West Bengal. The attack was directed by Kishenji, and after the Naxalites' raid at the paramilitary camp, Kishenji addressed the news media saying, "We have not started it (violence) and we will not stop it first. Let us see whether the central government is honest about a solution and we will definitely co–operate.... This is the answer to Chidambaram's 'Operation Green Hunt' and unless the Centre stop this inhuman military operation, we are going to answer the Centre this way only." On 6 April 2010, the Maoists ambushed and killed 76 paramilitary personnel who fell into a trap laid by the lurking Maoists. The CPI (Maoist) described the incident as a "direct consequence" of the Operation Green Hunt stating that "We have been surrounded by paramilitary battalions. They are setting fire to the forests and making adivasis (tribals) flee. In this situation, we have no other alternative (but to stage attacks)." On 25 May 2013, the CPI (Maoist) ambushed a convoy of the Indian National Congress at Bastar, and killed 27 people including Mahendra Karma, Nand Kumar Patel and Vidya Charan Shukla. While regretting the death