India, Feb. 26 -- A man allegedly slit the throats of his two-month pregnant wife and three daughters at their residence in outernorth area of the national capital, with police suspecting that his preference for a son could be behind the killings.

First responders at the Prem Chand Park area house on Wednesday morning witnessed a grisly sight 27-year-old Anita and her daughters, aged three, four and five years, lying in a pool of blood.

"All four victims had their throats slit with a sharp-edged weapon. The injuries were so deep that their windpipes was cut," a senior police officer said, describing the crime scene as "extremely brutal".

While investigators are probing all possible angles, including a suspected extramarital affair, pre...