Highly dangerous fireworks were stolen following a burglary at a farm in Codicote, Hitchin, Hertfordshire.
Police are warning about the dangers of setting off the professional display fireworks, which were stolen from the property off Whitwell Road.
The burglary happened at some point between 12pm on Tuesday 17 March and 9.50am on Wednesday 18 March.
Offenders broke into a building in the area and stole the fireworks, which can only be ignited electronically.
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Any attempts to ignite these fireworks manually would be highly dangerous, said police.
Investigating officer Chris Suckling said: “As igniting these fireworks manually is extremely dangerous, I’d like to warn whoever is responsible for this offence for their own safety and would advise them to return the fireworks to their rightful owners.
“I’d also like to appeal to anyone who knows who could be responsible for this crime, or who is aware of anyone acting suspiciously in the local areas during the stated times, to please come forward as soon as possible.”
Anyone with information is asked to contact PC Suckling via the non-emergency number 101 citing crime reference number G1/15/696.