The convicts were also held guilty by district and sessions judge U M Nandeshwar on murder charges under section 302 of IPC and sentenced them to life imprisonment yesterday.
According to prosecution, the convicts had beaten to death two sisters - Budhibai Dore and Kashibai Veer - in Take Harsh village in tribal-dominated Igatpuri tehsil in the district in 2014.
The 11 convicts are - Bachhibai Narayan Khadke (42), Laxman Budha Nirgude (30), Narayan Shiva Khadke (42), Waman Hanumanta Nirgude (40), Kisan Budha Nirgude (39), Hari Budha Nirgude (30), Sanibai Budha Nirgude (65), all residents of village Take Harsh; Bugibai Mahadu Veer (35), Mahadu Krishna Veer (40), both residents of Naseda Veerwadi, Mokhada in Palghar district; Govind Punaji Dore (31) and Kashinath Punaji Dore (31), residents of Dandwal in Palghar district.
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On October 30, 2014, the accused severely beat up the sisters in order to drive away the evil spirits from them, following which the sisters died. Rahibai, however, managed to escape.
Later, the sisters' bodies were buried by the accused, the prosecution said.
Later, Rahibai lodged a complaint with the police.
Apart from the Black Magic Act, the accused were booked under IPC sections 302 (murder), 307 (attempt to murder), 201 (causing disappearance of evidence) and 506 (criminal intimidation) of IPC.