South Korean investigators have combed footage from more than 50 state and private closed-circuit TV cameras as well as from social media, looking for answers to how a surge in Halloween party-goers trapped in narrow alleys killed so many.
As the country began a week of mourning, the death toll climbed to 159, with another 149 people injured and 33 of them in serious condition.
South Korean Prime Minister Han Duck-soo has promised a thorough investigation and authorities said they were focused on reconstructing the chain of events leading up to the surge and were looking at whether anyone may have been responsible for triggering the crush.