Twelve people were trapped in a Tokyo Tower elevator on Tuesday afternoon after one of its windows was smashed.

According to the tower's operators, 11 visitors and an employee were trapped in the elevator for around two hours after it made ​​an emergency stop at an elevation of 207 meters at around 2:30 p.m. TV Asahi reported that the elevator had been moving down from the observation platform 250 meters above the ground when the incident occurred.

One eyewitness told reporters, "Something resembling a metal sheet came flying at the elevator and smashed the window."

Police say that no serious injuries were reported, but that a 6-year-old boy sustained a minor cut to his elbow.

Police and tower officials have not yet been able to identify the metal object.

© Japan Today