At least 10 people were killed and eight fainted when they accidentally fell into a contaminated canal in Dera Ismail Khan on Friday.
Around 15 to 20 people were crossing the canal when two of them lost balance and fell into it. In an attempt to rescue their companions, more people jumped into the canal that was filled with poisonous industrial effluent.
Rescue workers recovered 10 bodies and eight unconscious people from the canal.
Police said a nearby sugar mill was spilling its poisonous effluent into the canal.