Beijing scaffold collapse kills 10, injures 4   

清华附中一在建工地脚手架倒塌 已致10死4伤(图)

Photo taken on Dec. 29. 2014 shows the construction site where a scaffold collapsed in the Tsinghua High School in Beijing, China. Ten people were killed and four were injured following the scaffold collapse in the school on Monday morning, local sources said. The injured were all rushed to the nearby hospital. Rescue work is under way. (Xinhua/Li Wen)

Ten people were killed and four injured in a construction site accident in a school in Haidian, Beijing, on Monday morning.

The incident, which occurred at a construction site on Tsinghua High School campus' south side, happened at around 8:20 a.m..

The findings of the initial investigation indicate that steel bars, used to reinforce concrete structures, collapsed and caused the accident.

According to the Beijing municipal government, police detained people "directly responsible for the accident", but did not give more details about their identities.

All the injured were taken to nearby hospitals for medical attention, and are in stable condition.

An injured woman surnamed Zhang is being treated at the No.306 Hospital of the People's Liberation Army. When the accident happened, she and her husband were busy binding the steel bars together.

"They collapsed suddenly, and I heard loud noises," she recalled.

The school remains open and classes have not been affected, although the usual morning outside exercise session was canceled for all students.

Ma, who lives near the campus, said he saw ambulances arriving at the school at around 9 a.m..

The school said no students were injured.

Beijing Mayor Wang Anshun and other officials arrived at the site as the investigation continues.

Tsinghua High School is a school attached to China's famous Tsinghua University. It will celebrate its 100th birthday next year.

"The Spring Festival, or the Chinese New Year, will be celebrated soon. I'm very sad that ten workers lost their lives, and their families will never see their day of reunion," a user named "Rondo" wrote on China's twitter-like Sina Weibo.