PRAGUE (AP) — An official says two workers are missing following a series of explosions at a military ammunition dump in eastern Czech Republic.

Libor Netopil, spokesman for the regional firefighters, says rescuers are not immediately able to enter the facility because of a threat of further explosions.

The accident took place on Thursday near the village of Vlachovice, located some 350 kilometers (220 miles) east of Prague.

Netopil says firefighters are using a helicopter to get details about the situation. He says the armory building has been completely destroyed.

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