MARION, Iowa (AP) – Authorities say the chemical that rained down on a northeast Marion neighborhood was a fungicide. Several people called 911 Tuesday night after noticing a white substance on vehicles and houses. The Marion Fire Department said in a news release Thursday that tests show the substance has components commonly found in a field treatment used by farmers.

Iowa public health officials say that after 12 hours, lawns or vegetation exposed to the fungicide weren’t expected to pose health risks to people. Officials say exposed hard surfaces should be cleaned with soapy water, and all clothes and bare skin that were covered by the substance should be washed. The incident is still being investigated.