At least one person was killed and another seriously injured when a blaze at a firework factory in Bulgaria set off a series of explosions.

Reports suggest there were two tons of explosive TNT in a warehouse.

Authorities said a 49-year-old man died of injuries while his 20-year-old daughter is in critical condition. Two men, a 22-year-old and a 60-year-old, remain unaccounted for.

Residents told local media that smaller bangs continued through the night and into Friday morning.

The area, surrounded by farmland, was closed off and military helicopters scanned the scene, a witness said.

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