Russian Scientist Released After Four Months in Federal Custody

Kseniia Petrova, the Russian scientist who spent four months in detention after failing to declare scientific samples she was carrying into the country, was freed on bail from federal custody on Thursday by a magistrate judge in Boston.

Since her detention at Boston’s Logan Airport in February, Ms. Petrova has been transferred to detention centers in Vermont, Louisiana, Oklahoma, and, briefly, Rhode Island, before returning to Boston early Thursday.