The Maoists had earlier shot village leader G Sanjiv Rao last week.
Saturday’s incident was the third such case in the region in the past fortnight.
The BBC had quoted a Maoist spokesperson after sister Valsa’s murder claiming responsibility for the killing.
The tiffin bomb was recovered from Faraspal village when a team of security personnel was patrolling the area.
The encounter started at 5 am and continued till 8 am with almost 200 rounds fired by the security forces.
The Home Ministry is implementing a scheme for ‘surrender -cum-rehabilitation’ of militants of North Eastern Region.
The rebels asked all the jawan’s family to vacate the house before they looted it, blew it up with a bomb and torched it.
In April, Maoists had killed a tribal youth in cut-off area of Malknagiri charging him to be a police informer.
PLGA ‘political head’ went missing three years ago, cadres tell mother he died handling explosives.
No casualty was reported in the blast that took place late on Tuesday night.
Police said the index of one of these notebooks carried the signature of “Vishwa,” suspected to be a name given by Maoists to Santosh Shelar
While the CRPF team came from Giridih, Jamui and Giridih police also joined the anti-Naxal operation late Thursday night.
There was no loss of life on either side.
The root causes should be properly identified and all attempts to solve the problem should be tried, it said in a statement
The government is planning to deploy young IPS officers who would lead assault teams against the armed rebels in the affected states.