Officers were left red-faced after an alleged thief escaped from Mongkok police station when he went to the toilet. The 23-year-old was arrested after he took a taxi from Tuen Mun to Mongkok, where he is said to have snatched a coin box from the driver and was chased by two officers. Police said that, when caught, he threw the coin box in the face of one of the officers. He was arrested for assault and theft. At Mongkok police station, an officer escorted the man to the toilet. When the man came out, the officer turned to lock the door but discovered the suspect had vanished. Chief Inspector Chan Wah-shing said an investigation was being held into Friday night's incident. Anyone with information should call 2398 6200 or 2527 7177.