The daily train derailed at 0735 hrs nearly 80 minutes after departure from Bengaluru between Anekal Road and Hosur on Bangalore City-Salem Section, on the border of Karnataka and Tamil Nadu, about 45 kms from the state capital, Railway and police officials said.
The victims included five men, three women and a nine- year-old, Divisional Railway Manager Anil Kumar Agarwal told reporters at the accident site, adding rescue and relief operation involved teams from Railway, police, fire brigade and National Disaster Response Force.
Agarwal said the engine driver had told authorities that he heard a rumbling sound of a boulder.
Prabhu who had announced he would rush to the accident spot did not do so and visited the injured at a private hospital on Bengaluru outskirts and flew back.
"I am on way to Bangalore to visit accident site to help all stranded...," Prabhu had tweeted earlier.
An inquiry into the mishap will be conducted by Commissioner Railway Safety S K Mittal.
Prime Minister Narendra Modi condoled the death of nine passengers, tweeting, "Saddened by the loss of lives due to derailing of Bangalore-Ernakulam Express. Condolences to the families of the deceased.
