According to the police, the 17-year-old and 18-year-old were alone at home. When their parents came back, they found the teenagers dead.
The bodies have been shifted to a hospital for their post-mortem examination.
A case has been registered against their father Manzoor Ahmed and brother Amir. They have been taken into custody and are being investigated.
The police said that initial investigations hint that the crime was an honour killing. “Something substantial can only be confirmed after a detailed investigation is conducted,” a police officer said.