The excessive heat across the region has triggered health alerts, shuttered schools and put pressure on power grids.
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The blast, which also injured several soldiers, occurred at an army base in Kampong Speu province, Hun Manet says.
New York district attorney accuses two prominent art dealers of the illegal trafficking of antiquities worth $3m.
Authorities across Cambodia have been ordered to remove musical horns from vehicles and put a stop to roadside dancing.