The toll may go up as many passengers are feared trapped in the mangled coaches of the train which derailed around 11 PM last night when it was on its way to Bhubaneswar from Jagdalpur.
The engine and nine coaches of the train went off the track near Kuneru station, Chief PRO of East Coast Railway J P Mishra told PTI.
So far, death of 27 persons has been confirmed by a team of doctors that has rushed to the spot, said Mishra.
"There is a strong indication of tampering with the track as the area is known to be a Naxal-prone zone and as Republic Day is approaching. Foul play cannot be ruled out," sources said.
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Terming the incident as "saddening", Prime Minister Narendra Modi said the Railway Ministry was monitoring the situation very closely and working to ensure quick rescue and relief operations.
He also wished for speedy recovery of all those injured.
"My thoughts are with those who lost their loved ones due to derailment of Jagdalpur-Bhubaneswar Express. The tragedy is saddening.I pray for a speedy recovery of all those injured due to the train accident," he said in a tweet.
Andhra Pradesh Chief Minister N Chandrababu Naidu reviewed the situation with ministers from north coastal Andhra and asked them to rush to the accident spot to supervise rescue and relief measures.
"We are investigating the cause of the mishap," the Chief Minister said, expressing anguish over the tragedy.
"I have directed administration to undertake relief and rescue operations. Railway Minister Suresh Prabhu has expressed his condolences. He has also announced an ex-gratia amount of Rs 2 lakh to the family of the deceased and Rs 50,000 to the seriously injured," he said.