Naxalites shot dead four policemen and blew up tracks at two places in Bihar's Lakhisarai district early on Tuesday, police said.
Scores of naxalites belonging to the banned CPI (Maoist) swooped on a camp of Bihar Military Police at Khaira village at around 1 am, shot dead four policemen and wounded three others, police said.
The naxalites looted one carbine, three self-loading rifles and ammunition before retreating.
Superintendent of Police S Malar Viji has rushed to the spot with reinforcements, sources said.
"The Maoist guerrillas blasted the railway track near the eastern cabin of Dhanauri station, about 20 km from here, on Kiul-Jamalpur section of Eastern Railway", DIG (Railway) Ajay Verma told PTI.
They fired and exploded bombs to scare away the railway staff before blasting the track in a stretch of about two metres. They also uprooted the track at Urain station in a stretch of about 10 metres.
Several trains were stranded due to the blasts.
"Superintendent of Railway Police (Jamalpur) Arvind Kumar has rushed to the spot with government railway police and railway protection force reinforcements", Verma said.