A man allegedly poisoned his wife and four children before trying to take his own life at Wazirpur village of Gurugram.Nazim, hailing from Moradabad in Uttar Pradesh, is in a critical condition at a hospital.The tragedy came to light on Saturday around 9 pm when Nazim’s brother, Zeeshan, arrived at the first-floor rented apartment to visit the family. Zeeshan saw that his sister-in-law, Najma, 35, and the four children were lying motionless on the floor and foam was coming out of the children’s mouths. Nearby, Nazim was found in a semi-conscious state writhing in pain with his wrists slit. A blood-stained knife was found from the spot.The deceased children have been identified as 12-year-old Iqra, eight-year-old Shifa, eight-year-old Aaram and six-year-old Khatija.Forensic experts believe the accused first administered poison to the children and then to his wife. While the nature of the poisonous substance is yet to be confirmed police have sent the bodies for post-mortem.Preliminary investigations suggest that Nazim, who operated a salon at Garhi Harsaru frequently had heated arguments with his wife. Police believe a domestic dispute on Saturday evening triggered the violent outburst. Neighbours said Nazim had moved to Wazirpur six months ago.The local police and forensic teams reached the site. While the woman and children were declared dead, Nazim was rushed to the hospital. The authorities have collected samples from the crime scene. A case is being registered.