Mr Sonowal said in a statement later that he had asked the Director General of SAI to rush to the spot and give a factual report on the incident.
“I am deeply aggrieved by the incident that has happened in Kerala. The young girl who has died was a very promising sportsperson. It is a big loss to the country in general and Sports Authority of India and sports fraternity in particular. I convey my condolences to the bereaved family. We will give all possible help to the bereaved family," he said.
"Three girls are still undergoing treatment. I pray for their speedy recovery. To provide them the best possible treatment is our top priority," he said.
"Local police is investigating the matter. I have also directed the Director General of SAI to rush to the spot and give me a factual report. I have specifically directed him to ensure that the best possible treatment is made available to the three girls who are undergoing treatment.
"While law will take its own course, at this stage I would only like to say that if anyone from Sports Authority of India is found guilty in connection with this tragic incident, strictest possible action will be taken against him or her," he added.
Mr Srinivas told newspersons in Delhi that it was the most shocking and tragic incident in the three-decade-old history of SAI, which is tasked with nurturing sports talent in the country.
He said he had been informed of the incident around midnight last night and has been in touch with Kerala government and local SAI officials since then.
"Our immediate priority is to deal with the medical emergency, to save the lives of the three trainees" he said. He said he had been told that there was no real antidote for the poisonous fruit and that, since the entire matter came to light only after some hours after they had consumed the fruit, the poison appeared to have entered their bloodstream and complicated matters.
Mr Srinivas said the four girls had reportedly left a suicide note jointly signed by them. One of the three girls in hospital, who is conscious and is able to speak, has deposed before the sub-divisional magistrate, he said. "All these matters will be investigated," he added.