TOKYO—Toyota Motor Corp. executive Julie Hamp was arrested Thursday in Japan for allegedly violating the country's narcotics control law, Japanese media reported, citing the Tokyo Metropolitan Police Department.

Ms. Hamp, an American, is suspected of having imported 57 tablets that contained narcotics to Japan from the U.S., national public broadcaster NHK reported.

NHK said the tablets were suspected of containing oxycodone, which is a legal prescription painkiller in the U.S. Imports of oxycodone are restricted under Japan's narcotics control law.

A package containing the tablets was intercepted by customs officers in Tokyo earlier this month, Japanese media said. Ms. Hamp is denying the allegation, saying that she didn't believe she imported narcotics, the reports said.

The Metropolitan Police Department and Toyota declined to comment in response to queries from The Wall Street Journal. It wasn't immediately clear whether Ms. Hamp has a lawyer.

Ms. Hamp, 55, became Toyota's first female managing officer in April, handling corporate communications. She has also worked at General Motors and Pepsi.

Write to Yoko Kubota at yoko.kubota@wsj.com

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