Dhawal Lahagania (24) and Mandira Chaudhary (26) -- both friends working in the same company -- had checked in the former's empty flat at Yamunanagar colony in the industrial township of Nigadi near here on Saturday afternoon.
They were unaware of the fumigation done by the pest control personnel on instructions of Dhawal's parents, who went out later to keep away from the place for mandatory 12 hours, police said.
According to the Nigadi police, Dhawal and Mandira experienced difficulty in breathing and felt suffocated after spending some time in the house as they inhaled the fumes.
The couple, however, succumbed to the affliction yesterday, police said.
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