Patna: Former chief minister Rabri Devi on Wednesday expressed apprehension of a threat to the life of her husband, RJD chief Lalu Prasad, who is currently undergoing treatment at the All India Institute of Medical Sciences, New Delhi.

Rabri said Lalu's blood sugar levels were not improving; rather, she said, they were increasing daily. The former Bihar chief minister alleged that AIIMS doctors were giving medicines to Lalu to increase his blood sugar and not to control it.

"Saheb (as Rabri addresses Lalu) is in jail and he is really in pain. He is battling for life at AIIMS. Lalu ji is being given wrong medicines and doctors are hatching a conspiracy to kill him. I am not a doctor but what I have heard is that his blood sugar is not going down, rather increasing every passing day. I do not trust the government neither the hospital," Rabri told The Telegraph at her 10 Circular Road residence.

Lalu's younger son and leader of Opposition Tejashwi Prasad Yadav had made a similar allegation earlier, accusing the BJP and chief minister Nitish Kumar of hatching a conspiracy to kill his father.

This is the first time that Rabri has expressed fear of a threat to Lalu's life. She would previously say her husband needed special care as he was suffering from many diseases, including high blood pressure to high sugar. Rabri's allegation came a day after security from her official residence was withdrawn.

A senior doctor and faculty member at AIIMS-New Delhi said the allegation made by Rabri Devi does not deserve a response.

"The only thing one can say is that we do not want to dignify such an allegation with a response," said the doctor, who spoke on the condition of anonymity.

An AIIMS doctor who is not familiar with the treatment that Lalu Prasad is undergoing said that had Lalu been a member of Parliament, doctors treating him would be obliged to send a daily report to the AIIMS medical superintendent.

"For a private citizen, there is no obligation for doctors to send a report to the medical superintendent," the doctor said. "It is up to the family members to release any information they might want to make public."

Lalu ceased to be a member of Parliament - he lost his Saran Lok Sabha seat - following his first conviction in the fodder scam in September 2013. Since then he has been convicted in three other fodder scam cases.

Additional reporting by our special correspondent in New Delhi