Rashtriya Janata Dal (RJD) leader Lalu Prasad, who was brought to AIIMS here on Tuesday, was kept under observation overnight in the emergency department before being discharged at around 3 am, official sources said.

The former Bihar chief minister, 73, was brought to AIIMS here at around 9 pm on Tuesday after being referred by a medical board of the Rajendra Institute of Medical Sciences (RIMS), Ranchi, as his health condition deteriorated there.