SHANGHAI, May 6 -- The manager of the company in charge of the demolition of a residential building in Shanghai which collapsed on Sunday killing two people has been detained, authorities said on Tuesday.

The collapsed building was a three-storey brick and wood private structure, scheduled to be demolished in 2002. In March 2006, the demolition stopped due to lack of funds.

An initial investigation showed the accident was caused by a Calor gas explosion, which also damaged a second building.