MADISON, Wis. - Federal investigators say open valves on farm fertilizer tanks apparently led to a serious ammonia leak that injured 41 people in Illinois in April.
The National Transportation Safety Board released a preliminary report on the anhydrous ammonia spill in Beach Park, Illinois, near the Wisconsin border.
The NTSB says a hazardous-materials team from Lake Forest, Illinois, found some valves were fully open on a pair of 1,000-gallon tanks, which were being pulled by a tractor. The ammonia release stopped when a valve was closed. Investigators plan to examine the valves at a laboratory in Washington.
The NTSB says the loaded tanks were picked up at a farm cooperative in Kansasville, Wisconsin, about 30 miles (48 kilometers) from the accident scene.
Anhydrous ammonia is a colorless gas used as an agricultural fertilizer that produces pungent, suffocating fumes when released.
Get your weather forecast from people who actually live in your community. We update with short, easy-to-use video forecasts you can watch on your phone every day. Download the iOS or Android app here.
- Americans borrow $88 billion annually to pay for health care, survey finds
- Hour of activity may keep disability away, new research shows
- DNA helped crack 1983 rape case
- Lead in Newark's water has mom worried 5-year-old 'being poisoned'
- More than 120 cases of lung disease could be linked to vaping
- Planned Parenthood may reject fed funds