North Korean leader, Kim Jong-un reportedly ordered the execution by firing squad of four engineers and architects behind the 23-storey building that crumbled in the capital Pyongyang on May 13, 2014 leading to the death of more than 500 people, including members of the State Security Department,
92 families lived in the building as at the time it collapsed and most of the people killed were high-ranking intelligence and security officials.
Kim Jong Un gave a rare public apology to North Koreans after the collapse occurred and ordered an inquiry. The four engineers were reportedly executed last week.
The main cause of the building collapse remains unclear but shoddy construction is said to be a likely cause because onsite directors and workers often smuggle out steel and cement to sell in black market.