May 23 (Reuters) - Amazon.com ( AMZN ) was sued on

Friday by consumers over its alleged sale of a wide variety of

rice contaminated by arsenic and other "heavy metals."

The proposed class action in Seattle federal court covers 18

types of rice sold through Amazon ( AMZN ), including from familiar

brands such as Ben's Original and Amazon ( AMZN )-owned Whole Foods' 365.

"Amazon ( AMZN ) sold these rice products with alarmingly high levels

of heavy metals to an intended consumer audience that includes

children, with no warning whatsoever about the dangers of heavy

metals," the complaint said.

The lawsuit followed a study last week by Healthy Babies,

Bright Futures, a nonprofit that focuses on babies' exposure to

toxic chemicals.

That study found arsenic in all 145 rice samples purchased

nationwide, with 28% exceeding a U.S. Food and Drug

Administration limit for infant rice cereal.

It also found cadmium in all but one sample, and lead and

mercury in more than one-third of tested samples.

Amazon ( AMZN ), based in Seattle, had no immediate comment.

Exposure to heavy metals has been associated with negative

health effects such as nervous system problems, immune system

suppression and kidney damage, and autism spectrum disorder and

attention deficit hyperactivity disorder in young children.

The 18 rice products include two from Ben's Original and

three with the 365 label.

Plaintiffs Ashley Wright and Merriman Blum said they would

not have bought or would have paid less for Iberia Basmati 100%

Aged Original rice, one of the products, if they knew the rice

was contaminated or Amazon ( AMZN ) never tested it for heavy metals.

Friday's lawsuit seeks unspecified damages of at least $5

million for Amazon's ( AMZN ) alleged violations of Washington state

consumer protection laws.

Makers of baby food and dark chocolate have also faced many

consumer lawsuits over the alleged presence of heavy metals.

The case is Wright et al v Amazon.com Inc ( AMZN ), U.S. District

Court, Western District of Washington, No. 25-00977.