A Russian scientist at Harvard University’s Medical School discussed her plans to smuggle frog embryos into the U.S. ahead of being caught and arrested by U.S. Immigration Customs and Enforcement, according to the Department of Homeland Security.

A Russian researcher at Harvard University is being detained over failing to declare frog embryos while passing through customs, according to a filing by her attorney.

A Russian scientist, Kseniia Petrova, working at Harvard Medical School, was detained by ICE agents last month at the Boston Airport where she landed from a personal trip to France. The customs officials found frog embryos in her luggage that she did not declare because she said she did not know that she was supposed to do so.