Gono Odhikar Parishad president Nurul Haque Nur left Dhaka for Singapore on Monday morning for advanced medical treatment.
A flight of Bangladesh Airlines, carrying Nur and his physicians, departed Hazrat Shahjalal International Airport at about 8:25AM.
He will receive treatment at Mount Elizabeth Hospital, his party sources informed.
Nur was seriously injured during a police action at Kakrail in the capital on August 29. Since the attack, Nur has been receiving treatment at Dhaka Medical College Hospital and a private hospital for 18 days.