PHOENIX — Unidentified seeds that authorities have warned about and appear to be from China have surfaced in Arizona.

The Arizona Department of Agriculture is asking residents who recently received seeds in the mail that they didn’t order not to throw them out, but to instead send or drop them off at department location in Phoenix, Tucson or Yuma.

While the U.S. Department of Agriculture posted a notice to its site stating it will test the seeds it has collected, the department said there was no evidence indicating it to be anything other than a scam.

“At this time, we don’t have any evidence indicating this is something other than a ‘brushing scam’ where people receive unsolicited items from a seller who then posts false customer reviews to boost sales,” the statement said.

The department warned people not to plant the seeds. Unknown seeds have the potential to be invasive to the environment.

Agriculture departments in 30 states have released warnings about the seeds, according to USA TODAY.

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