Leaders of the BJP-led NDA on Sunday told Governor Ram Nath Kovind that law and order was deteriorating in Bihar and referred to the three "political killings" since February 5.
"We have submitted a memorandum to the governor and requested him to instruct the government to do something about the collapsing law and order situation," BJP leader Prem Kumar told reporters here.
Criminals have been targeting people like never before, state BJP president Mangal Pandey said.
Jailed gangsters and criminals have been threatening people from jails and demanding extortion money, the leaders of the National Democratic Alliance (NDA) told the governor.
Former chief minister Jitan Ram Manjhi, who leads the Hindustani Awam Morcha, and Chirag Paswan, working president of the Lok Janshakti Party, demanded imposition of President's Rule in Bihar.
Three politicians of the NDA have been killed in Bihar over a span of nine days this month.
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BJP's Bihar unit vice president Visheshwar Ohja was shot dead on Friday in Bhojpur, less than 24 hours after another BJP leader, Kedar Singh, was gunned down in Saran.
LJP leader Brijnathi Singh was shot dead in Patna on February 5.
Former RJD leader and Lalu Prasad's brother-in-law Sadhu Yadav was booked in a case for allegedly demanding extortion money from a builder here, the police said on Thursday.
The BJP on Saturday protested against Ohja's killing by forcing closure of markets in Bhojpur.
The NDA called for a day-long strike on Sunday in Shahabad region, which includes Bhojpur district, against Ojha's killing. The call evoked a mixed response.
A group of activists of the NDA, mainly the BJP, disrupted train traffic in Ara town in Bhojpur district.
The NDA delegation that met Governor Kovind included BJP MPs C.P. Thakur and Ashwani Kumar Choubey, in addition to Prem Kumar, Pandey, Manjhi and Paswan.