Guests of a wild west-themed costume party got a scare when a posse of armed police officers stormed into the hootenanny thinking toy guns carried by partygoers were real, several British media outlets reported.

The festivities were held Saturday by Roy and Val Worthington of Leicestershire, England, to celebrate their 25th wedding anniversary. But the celebration quickly turned into a disaster when three police cars and a helicopter showed up to investigate, the BBC reported.

"It was a bit over the top with the helicopter," Roy Worthington told the BBC.

The Leicestershire Police Department, however, defended the party crashing.

“We have a duty to treat all reports of firearms as genuine,” a police spokeswoman told the Daily Mail newspaper.

In an interview with the BBC, Val Worthington claimed that she had called police last November to notify them that some of her guests may be carrying toy guns.

Click here for a video report from the BBC.

Click here for more on this story from the Daily Mail.