The environmental agency has warned people to avoid going near the substance as it could pose a health risk.
Related stories
Madonna tops Taylor Swift in nominations for MTV’s Video Music Awards
Ohio death row inmate gets rare chance to seek pardon after 30 years
Bolivia arrests political adviser to Latin American right-wingers
Harvard to pay $53m over theft and sale of human remains from medical school
Exclusive: Trump admin reveals plan to lock 3,000 migrant children in massive new detention facility
Florida official arrested on child molestation and kidnapping charges