WATCH: Gender reveal party ignites wildfire

It's a boy! It's a girl! But for an off-duty border patrol officer in the US state of Arizona, it ended up being a massive wildfire sparked by a gender reveal party that went awry.

A video released by the US Forest Service and carried by US media on Wednesday, shows the moment a makeshift target with the words "Boy" and "Girl" written on it explodes in an open field, revealing a plume of blue smoke and sparking a fire.

The April 2017 blaze, dubbed the Sawmill Fire, scorched nearly 47 000 acres in Green Valley, Arizona, and was fully extinguished after about a week.

Dennis Dickey, who organised the party to reveal the gender of his upcoming child, pleaded guilty to a misdemeanor charge in September and was ordered to pay nearly $8.2m in restitution.

He was also sentenced to five years' probation.

Authorities said Dickey started the fire by shooting at the target that he had filled with Tannerite, a highly explosive substance.

The idea was to release blue or pink smoke to reveal the sex of his upcoming baby.

Such gender reveal parties are increasingly popular in the United States and can take on many forms, including unraveling a banner, cutting open a cake or tainting drinks in blue or pink.

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