Karachi: 3 laborers have died during cleanliness work in a sewer manhole in Karachi. As per media reports 3 laborers died while cleaning gutter in sector 36 Lyari. They died due to suffocation. Chief Minister Sindh has expressed sorrow and grief over death of the laborers besides seeking report. It is pertinent to mention here earlier several laborers died from suffocation during cleanliness work in gutters.