Distraught relatives at a local hospital said around a dozen people were believed to be entombed in the concertinaed floors of the building, which collapsed before dawn on Saturday as dozens of workers slept.
Cambodian Prime Minister Hun Sen arrived at the scene Monday, saying he would take personal charge of the rescue operation as diggers and hundreds of rescuers cleared twisted metal and concrete around the clock.
It also instructed the committee to evaluate the qualifications of construction companies and to update the already-constructed buildings.
At least three people died when an under-construction building collapsed at a Cambodian beach resort early Saturday, officials said, with fears an unknown number of others may still be buried in the rubble.
On Monday, Hun Sen, the Cambodian prime minister, made a decision to remove Yun Min, the provincial governor from his post over the accident, the worst of its kind in recent Cambodian history.
Prime Minister Hun Sen is heading to the region.
Provincial authorities said in a statement that four Chinese nationals involved in the construction have been detained while an investigation into the collapse is carried out.
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The next year, Iranian news agencies published footage Iranian officials claimed they had obtained from the RQ-170, CNN reported . Iran denies any involvement. "It's always on the table until we get this solved", the president said in response.
Yun Min, Governor of Preah Sihanouk province, this morning resigned from his post, asking on his Facebook page for "forgiveness from the families of all the victims".
Numerous buildings catering to Chinese tourists have been constructed in the region over the past few years, including dozens of casinos, according to BBC News. One of them, Nhor Chandeun, said he and his wife were sleeping when they heard a loud noise and felt the building vibrate then begin falling down.
Seng Loth, a spokesman for the Ministry of Land Management, Urban Planning, and Construction, said the building was constructed without permission. But Mr Chandeun, who was trapped inside the wreckage with his wife for 12 hours before being rescued, estimated the total at 55 to 60.
It said the embassy was greatly saddened by the collapse and had reached out to Chinese enterprises in Cambodia to mobilise personnel as well as heavy equipment such as excavators to clear the rubble.
"Fortunately the rescuers found me in time", he added.
He ordered inspections of all building sites in the town, where condos and hotels are springing up to cash in on the surge in Chinese visitors to its dozens of casinos.