Guerrillas of the banned organisation descended on Balua-Gausnagar village under Runni Saidpur police station, about 30 km from Sitamarhi, and set on fire three private buses parked in front of the house of former Sitamarhi Block Development Committee chief Rameshwar Yadav, Deputy Superintendent of Police J N Jha told PTI.

They also severely beat up a cleaner, who was hospitalised, he said.

The CPI (Maoist) had called a 24-hour bandh in Bihar, Jharkhand, Orissa and Chhattisgarh from Sunday midnight to Monday midnight to protest the recent arrest of their leaders Narendra alias Osho in West Champaran district of Bihar and Sheela Marandi at Raniganj in Jharkhand.

Meanwhile, the Bihar Government has extended the alert sounded across the state for the bandh till November 7, the day the naxalites have declared to observe Kranti Divas (revolution day), state's Home Secretary Afzal Amanullah said in Patna.

He said the leave of all senior police officers had been cancelled in view of the event as there were apprehensions that the outfit might create disturbance.

In Jharkhand

Suspected Maoist guerrillas blew up a vacant building, close to paramilitary camps, near Madhuban police outpost in Jharkhand on Tuesday morning.

The Border Security Force also recovered two landmines from an adjacent building around the same time, Superintendent of Police Arun Kumar Singh said.

Maoists exploded two landmines in the building, which was very close to two others used as makeshift camps by paramilitary forces, Singh said.

The blast in the unused building was heard at around 1 am. While Central Reserve Police Force personnel occupied one of the nearby buildings, the other was used by the BSF.

The two landmines, each weighing 15 kg, were recovered from the house used by the BSF, he said.