Dhaka, June 9 -- Police have arrested a "mentally unstable" woman over killing her 95-year-old mother by hacking in Harirampur Upazila of Manikganj.

The incident took place around 10:30am on Tuesday in Madhyadhusuria village of Gala Union, said Harirampur Police Station chief Afzal Hossain.

The deceased has been identified as Rezia Begum, 95.

The arrestee Rokeya Begum, 60, is the daughter of the deceased and the wife of the late Malek of Hatipara.

Police officer Afzal said, "In the morning, Rokeya hacked her mother Rezia to death with a kitchen machete found in the house. Later, she called her elder brother Mofazzal Hossain's son Russell and told him that she had hacked his grandmother.

"When the matter came to light, the neighbours ...