Bangladesh's interim leader, Fakhruddin Ahmed, has fainted while giving a speech near the capital, Dhaka.
Mr Ahmed was taking part in a tree-planting ceremony
"Fakhruddin Ahmed was addressing a tree plantation programme in Tangail when he lost consciousness and collapsed," a government official told Reuters.
Mr Ahmed was taken to a local hospital, but his condition was not known.
Bangladesh has been sweltering in a recent heatwave, with temperatures as high as 39C leading to more than a dozen deaths from heatstroke.
Mr Ahmed took over as Bangladesh's military-backed leader after the January elections were cancelled following months of political turmoil.