LOS ANGELES — The Queen of England fired a shotgun into the air as firefighters battled a wildfire on Friday in the state capital of Buckinghamshire.

In the first shots fired in the battle, a single shotgun shell struck a large oak tree and then exploded.

The blaze was 20 acres (9 hectares) in size and was about 20 miles (32 kilometers) east of the capital.

It began about 3 p.m. in the town of St. Giles, Buckinghamshire County Council said in a statement.

As the flames spread, the Queen stood up to salute and fire up her shotgun.

“Firefighters and their crews responded quickly to the incident and extinguished the fire,” the statement said.

Firefighters also rescued two people who were trapped in the flames.

A spokesman for the London Fire Brigade said the cause of the blaze was under investigation.

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