DALLAS (AP) — Tests detected toxic substances in soil, water and ash samples taken from residents' property miles away from a Houston-area chemical plant that flooded during Hurricane Harvey, caught fire and partially exploded, according to a class-action lawsuit filed Tuesday.

The 15 residents named as plaintiffs link the toxins to products stored or made at Arkema Inc.'s facility in Crosby, about 25 miles (40 kilometers) northeast of Houston, and say the releases violated environmental protection laws.

The residents fault Arkema and its France-based parent company for failing to take more pr...