New Delhi, Sep 10 - A Central Bureau of Investigation (CBI) team will begin Friday its probe into the helicopter crash that killed Andhra Pradesh Chief Minister Y.S. Rajasekhara Reddy and four others last week, an official said Thursday.

'A team led by Nageswara Rao, CBI Superintendent of Police in Vizag, will start its investigation (into the chopper crash) Friday,' CBI spokesperson Harsh Bhal told IANS.

Bhal said Rao will be assisted by at least two officers from Hyderabad and 'as of now nobody from Delhi will be part of the team'.

He said the ongoing CID investigation into the crash will continue.

There is still no light on the circumstances that led to the chopper crash - more than a week after the accident - last Wednesday.

The police and the Directorate General of Civil Aviation (DGCA) have so far failed to ascertain if the crash was due to human error or technical failure. The Bell 430 chopper crashed on a hillock in the dense Nallamalla forests, 40 nautical miles from Kurnool.

Besides the CID and CBI probes, the state government has also announced a parallel inquiry by a two-member expert committee.