Former prime minister Manmohan Singh was admitted to the All India Institute of Medical Sciences (AIIMS) after he complained of weakness following a fever, sources said.

They said the 89-year-old Congress leader had a fever on Monday and had recovered, but he turned weak and was on fluids. The former prime minister was admitted to the cardioneuro unit of the AIIMS and is under the care of a team of cardiologists led by Dr Nitish Naik, Singh's personal physician for years.