A week after the helicopter crash that killed Andhra Pradesh Chief Minister YS Rajasekhara Reddy and four others, there is still no light on the circumstances that led to the accident.

It is still not clear if it was a human error or a technical failure that led to the crash of the Bell 430 on a hillock in the dense Nallamalla forests, 40 nautical miles from Kurnool, last week on Wednesday.