Fifteen men charged following an accident that caused 10 deaths and four injuries last year stood trial at Beijing Haidian District People's Court on Friday.

On Dec 28, the upper tier of a building under construction in the High School Attached to Tsinghua University collapsed because of an imbalance in the reinforcing bars.

"The imbalance was attributed to 24 disorderly reinforcing bars on the upper tier, or they were not piled in accordance with the construction plan," said prosecutor Chen Chen.