By Tim Hanlon A plane with 50 passengers on board has been forced into an emergency landing just minutes after taking off from an airport in Japan. The United Airlines Flight 166 was quickly brought back to Fukuoka Airport with an investigation now underway into what happened. The Boeing 737 took off around 11.45am before swiftly returning to the runway. The runway at Fukuoka Airport had to be temporarily closed for safety checks to take place after the emergency landing. Police have said that nobody was injured in the incident and it is believed that the cause may have been an irregularity wi…