Five members of a family, including three children, were killed in Puragardeia locality under Shivkuti police station in Allahabad in the wee hours of Sunday.
The incident came to light at around 7.30am when a female member of the family went to the first floor of the house and found the victims with their throats slit.
The deceased included head of the family Moharram (52), his daughters Ballu (6) and Nandini (8), and sons Vishal (15) and Chhotu (10).
Moharram’s wife, Didiya (47), who survived the attack, is fighting for her life at SRN Hospital.
The family was involved in rag-picking and used to deal in scrap.
IG, Allahabad zone, SK Pratap said prima facie the killings took place due to a property dispute.
“We have detained a suspect in connection with the murders and we are interrogating him,” Pratap added.
Commissioner, Allahabad division, Rajan Shukla, SSP Joginder Kumar, SP, city, Rajesh Yadav and other senior police officials visited the spot.