Police investigating the rape of an elderly nun in the Indian state of West Bengal says they have arrested a key suspect in the crime.

In the present scenario, the law puts the burden of proving the guilt on the prosecution. Unfortunately, this well recognised principle of preventing the misuse of power leads to investigators being bribed, witnesses suborned and material facts altered.

The main suspect in the rape of an elderly nun in West Bengal has been arrested, Indian police say.

A 32-year-old woman was beaten up and sexually assaulted by a cabbie inside a black-and-yellow taxi in Dwarka, Delhi on Thursday night.