Ahmed was discharged from the same hospital on Tuesday afternoon.
"Ahmed was taken to NEIGIHMS after he repeatedly complained of chest pain and other health problems last evening," East Khasi Hills superintendent of police M Kharkrang told PTI.
Since the hospital authorities had in writing suggested that Ahmed be given medical treatment whenever he complained of chest pain, he was taken to NEIGIHMS for treatment where he was later admitted, he said.
When he was produced at the court of chief judicial magistrate K M L Nongbri here, a weak looking Ahmed had also said the same to the judge, who directed the investigation officer to provide medical treatment.
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The BNP leader was arrested on May 12 for entering the country without any valid documents and had last week moved court seeking bail for treatment in a Singapore hospital, where he had been undergoing treatment prior to his disappearance from his country in March.
The Meghalaya police will be submitting a report on Ahmed's arrest tomorrow when his bail application is also likely to be taken up.