Chopra in North Dinajpur district in north Bengal turned into a battleground on Sunday afternoon, hours after a 15-year-old girl was allegedly raped and murdered. But police said the post mortem revealed that she died of poisoning.

The girl had appeared for the class 10 state board examination this year.

Local people torched three government buses and two police vehicles and vandalised a number of other vehicles. Shouting “we want justice,” the mob also attacked policemen while Bharatiya Janata Party leaders took up the issue alleging that the girl belonged to a family of BJP supporters and thus became a target of goons backed by the ruling Trinamool Congress party.

At least 30 people, including some police personnel, were injured in the pitched battles. Tension was palpable in the area till late evening.