At least six improvised explosive devices (IEDs), planted by Maoists to target security forces, were Sunday found in separate places in the Maoist-hit Bastar region in the poll-bound central Indian state of Chhattisgarh, around 1,200 km from here. These include a pipe-bomb of 35 kg at Mangnar village and five IEDs, each weighing two kg, at Gudabeda village of Kanker district in the north Bastar region, police said.