Suspecting his wife of having an extra-marital affair, a 24-year-old man killed the woman and their one-and-a-half-year old son with a sharp-edged weapon in Delhi's Shakurpur area, an official said on Saturday.

The incident took place on the intervening night of Friday and Saturday.

The police said that the accused -- identified as Brajesh, a native of Aurraiya district in Uttar Pradesh -- has been arrested.

According to the police, at about 3 a.m. on Saturday, a call was received at the Subhash Place police station informing about the incident following which a police team was rushed to the spot.

The mother and the son were taken to a hospital where they were declared brought dead.

"On inquiry, it was found that Brajesh, who used to live with his family in Shakurpur and worked as a labourer, killed his 24-year-old wife and infant son with a sharp-edged weapon," said a senior police officer.

"Brajesh is an alcoholic who suspected his wife, whom he married in 2016, of having an extra-marital affair. Their four-year-old son was found alive," the officer said.

"A case under Section 302 of the Indian Penal Code has been registered and the accused has been arrested," he added.

(SJ/IANS)