Authorities have ordered about 5,000 people surrounding a northeastern Pennsylvania town to evacuate after a tractor-trailer carrying a hazardous chemical overturned.

Officials say a tanker truck carrying more than 16 tons of corrosive hydrofluoric acid overturned early Saturday outside Wind Gap, about 60 miles north of Philadelphia.

Northampton County spokesman John Conklin says hazardous materials teams are wearing full protection suits as they work to stop the slowly dripping liquid.

Conklin says the truck driver was treated for injuries and released. There were no other immediate reports of injuries.

According to the Centers for Disease Control and Prevention, hydrofluoric acid in low doses can irritate the eyes, nose, and respiratory tract. Inhalation can be fatal.