They were abducted at gun point by the militant group a month before, Mizoram police said.
The workers of the Anupam Bricks and Concrete Industries (ABCI) were abducted by an armed militant group of NLFT on March 25 from their working site at Mauzam village in South Mizoram's Lunglei district, bordering area of Mizoram-Bangladesh.
''The outfit group demanded Rs 1.20 crore as ransom for the abducted workers' release,'' said a source of Mizoram police.
The militants left away the abducted workers after more than a month at Rajiv nagar area near Tupuibari, bordering area of Tripura, Mizoram and Bangladesh on Wednesday.