Health authorities said 46 people, including five children, were injured by explosions. The government has introduced a state of emergency and begun evacuating Arys' 45,000 residents. About 1,000 police and army troops have been sent to the area to maintain order.
The explosions at the depot have been powerful enough to have been registered by the nation's seismic service. The cause of the fire wasn't immediately clear. A criminal probe has been launched.