Giridih, April 2 (ANI): In a joint operation, police along with paramilitary, Central Reserve Police Force (CRPF), in Jharkhand seized huge cache of explosive material that could have allegedly been used by Maoists to attack security forces during upcoming elections. Maoists have been resisting any democratic process in the region from decades. A big challenge faced by security officials is conducting polls without any troubles or disruptions. Prime Minister Manmohan Singh has previously described the Maoist insurgency as India's biggest internal security challenge.