Police have seized fireworks which they say were 80 times above the legal limit allowed for private storage.
Officers in the German city of Hamburg say a tip-off from the 23-year old suspect's neighbour led them to discover pyrotechnics with a total weight of 850kg (134 stone/1,873 pounds).
The haul included 80kg of explosive substances. The legal limit is one.
The fireworks were packed into the suspect's apartment, cellar and two vans, a police spokeswoman told the DPA news agency.
Fireworks including rockets, like in the UK, are an essential part of New Year's festivities in Germany.
Consumers spent €137m (£123m) on them over the three days of permitted sale last year.
Many are fired from balconies and even roof-tops while rockets and other fireworks accounted for two fatalities in the country on New Year's Eve alone last year.
A 14-year-old is reported to have lost fingers to firecracker blasts gone wrong, while an 18-year-old was taken to hospital for severe burns.
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