Some 33 people including five children have now died in central Pakistan after eating sweets accidentally tainted with insecticide, officials said Sunday.

The mass poisoning occurred in the Karor Lal Esan area of Punjab province last month.

“The death toll from poisonous sweets has risen to 33 and 13 other victims are still in hospital,” district police chief Muhammad Ali Zia told AFP.

Local resident Umar Hayat bought the baked confectionery on April 17 to distribute among friends and family to celebrate the birth of his grandson.

Police were investigating how the chemicals were introduced into the sweets preparation process, he said.

Police last week said the worker may have inadvertently added pesticide to the sweet mix since there was a pesticide shop close by which was being renovated, and the owner had left his products at the bakery for safe keeping.