A 21-year-old man was arrested for allegedly killing his grandparents and stealing money and gold from their home in the city, police said on Wednesday.

"Pramod, along with his two friends Hassan Pasha and Praveen, killed his grandparents on Sunday at about 3 p.m, at their home in Ashwath Nagar (a suburb in the eastern part of the city)," Commissioner of Police T Suneel Kumar told reporters in Bengaluru.

The deceased, Govindan (65) and Saroja (60), were the maternal grandparents of Praveen. While the incident occured on Sunday, the crime went unreported for two days with family members believing that the elderly couple had gone to Kanchipuram. 

The bodies were found by the police on Tuesday night after the neighbours called the police as a foul smell emanated from the house, the police commissioner said.

"The accused have confessed to committing the crime after they were arrested on Wednesday and interrogated by the police," he said.

About Rs 50,000 cash, along with 220 grams of gold, was stolen by the accused from the house, he added.

Police also confirmed that the accused persons tried to cover up the crime by re-entering the crime scene and staging it to appear like a cylinder blast however the police caught wind of this in their investigation and moved to nab the three conspirators of the crime. 

Pasha however resisted arrest and attacked constable Ravi Dashvala with a knife. He was subsequently shot by sub-inspector Prasheela in his leg. The constable sustained minor injuries.  

A few weeks ago, Pramod had assaulted another family member in Ulsoor. "Both Pasha and Pramod have cases of theft against them. The crime branch had information on the trio due to a history of complaints and immediately brought them for questioning," said Police Commissioner T Suneel Kumar