A seven-storey building has collapsed in Cambodia killing at least 18 people and injuring at least another 24, with several in critical condition and others reportedly missing according to officials.

The Chinese building owner, the head of the construction firm and the contractor have been arrested with a Cambodian landowner also being questioned.

The building was under construction at the time of the collapse with construction workers telling the Associated Press they were also living in the building, and correspondents adding the collapse will raise concerns over the rate and sustainability of construction in the Cambodian city.