Mahmud went to Dhaka's Hazrat Shahjalal International Airport to "catch a flight en route to Delhi," an Airport Aviation Security official was quoted as saying by the Dhaka Tribune newspaper.
A T M Azharul Islam, a top leader of fundamentalist Jamaat-e-Islami party, was sentenced to death on Tuesday by a Bangladeshi special court for committing war crimes during the country's independence war against Pakistan.