Bungling cops arrest each other.

From Ananova:

Berlin police officers arrested each other as robbers made off with the cash after holding up an off licence.

Two crooks threatened a female employee with a machete at the cash-and-carry selling booze in the city's Charlottenburg-Wilmersdorf district.

When the woman opened the till and handed over £5,000, the shop's silent alarm went off.

Plain-clothes policemen arrived at the store minutes later but ended up being arrested when uniformed officers stormed in seconds afterwards.

The crooks escaped and police have issued an apology over the mix-up.