Two people remain hospitalized days after two large containers of liquid anhydrous ammonia leaked while being hauled on Green Bay Road near 29th Street in Beach Park, authorities said.
 
Lake County Sheriff's Sgt. Christopher Covelli said the two civilians who remain hospitalized have been upgraded from critical to serious condition and have been moved out of the intensive care unit.
 
The remaining 21 civilians, 11 firefighters and three law enforcement officers who were injured after inhaling toxic fumes have been released from hospitals, he said.
 
No charges have been filed against the 59-year-old Wisconsin man who was driving a tractor hauling the chemical to a farm field at 4:30 a.m. Thursday in Beach Park, Covelli said. That driver and the tractor's owner are cooperating with investigators from the sheriff's office and the National Transportation Safety Board to determine the cause of the leak, Covelli said.
 
NTSB investigators have said that investigation could take up to a year, Covelli said.
 
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