Winds up to 100km/h (60mph) hit the Patuakhali district as the storm headed for the ports of Chittagong and Cox's Bazar. Around one million people were evacuated from low-lying areas in both Bangladesh and Myanmar.
Bangladesh and Myanmar continue to evacuate hundreds of thousands living in low-lying costal areas ahead of Cyclone Mahasen's expected landfall Friday morning.
Radicals in Jakarta rallied Friday to call for a "Myanmar jihad" to avenge Muslim deaths after two Indonesians were detained over a plot to bomb the Myanmar embassy.
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