NEW DELHI (AP) — Authorities say leftist rebels detonated a land mine under a police vehicle and killed seven officers in the central jungles of India.

The officers had been part of a special force tasked with flushing the Maoist rebels out of their strongholds in the states of Maharashtra and Chhattisgarh.

Police told Press Trust of India that the blast Sunday was followed by a gunbattle between police and the insurgents in the Maharashtra district of Gadchiroli. Two officers were hospitalized with injuries.

The attack follows Friday’s arrest of a New Delhi university professor for alleged links with the rebels, who claim inspiration from Chinese revolutionary leader Mao Zedong and recently have carried out a violent campaign to discourage voting in Indian elections that end on Monday. Results are expected Friday.