Three migrant labourers from Bihar died on Thursday due to mudslide while fitting sewer pipes in village Kapro in Narnaund sub-division of this district, a senior official said. The work of sewerage pipes fitting was going on near Indraj Park in Kapro village for which these labourers were working 10-12 feet below, Narnaund's Sub Divisional Magistrate Vikas Yadav said.