I later realized that the jam was caused by a temporary road closure. Pockets of concerned people were already there when I reached the site. Two units of excavators and teams of men were working frantically. I asked a fireman standing next to me what they were searching for and he resignedly told me that they were looking for casualties. 
You can see a wooden shed (in blue) perched precariously at the edge of the slope. I hope it has been evacuated. 
The ambulance vehicles were on standby. 
The heavy rains had caused the uphill area behind the petrol station to be saturated of water for the past week. This resulted the slope being unable to withhold the extra pressure. I guess the feather that broke the camel's back was last night's pouring rain.*Update @ 2:00pm from Bernama.
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