GUIYANG, June 10 -- Four kids from one family in southwest China's Guizhou Province have died from suspected pesticide poisoning, local authorities said Wednesday.

Three girls and a boy aged between 5 and 13 were found dead at home in Tiankan township in the city of Bijie Tuesday night, the city government said in a statement.

They had been left home alone, and their parents are migrant workers and they have not be contacted.

An investigation into the cause of the deaths is under way.