Meanwhile, immigration police last Monday nabbed 113 foreign workers - 39 Bangladeshis, 40 Nepalese, 27 Pakistanis, two Indians and five Vietnamese - for not having proper travel documents, reports The Star, an English newspaper in Malaysia.
Rescuers rushed to the Tanjung Bungah area on the north of Penang after the accident was reported, the fire and rescue department said.
Penang Island City Council mayor Maimunah Sharif said it was not clear what caused the accident but ruled out the possibility of wet weather as there had not been heavy rains for some days.
Fire and rescue official Mohamad Rizuan Ramli said a 10-meter hill slope crashed down at the construction site in northern Penang state, a popular tourist destination, early Saturday.
The landslide occurred at a construction site around 9am, where two 49-storey condominium towers are being built.
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The state Fire and Rescue Department is leading the rescue operation along with federal and state agencies.
An aerial view of the construction site that collapsed, in Tanjung Bungah, on Oct 21, 2017.
"I was operating the crane when suddenly the earth caved in".
A worker who was at the construction site when the incident happened said he escaped the landslide because he had moved away.
The report added that the hill face that slid down was estimated to be 10m high. "Hopefully, the search and rescue mission runs smoothly, let us pray together", Najib said in a note on his official Twitter account.