Russian officials temporarily detained and then banned two American journalists from conducting an investigative-journalism workshop in St. Petersburg.
The men were found by a court on October 16 of violating Russian visa regulations and released after several hours.
Randy Covington, a professor at the University of South Carolina, and Joe Bergantino of the New England Center for Investigative Reporting were detained by immigration authorities while conducting the first of a two-day workshop for 14 Russian journalists.
St. Petersburg's branch of the Federal Migration Service said the men's activities "did not correspond" to the purpose of their trip to Russia.
Officials said they could no longer teach the workshop but were free to leave Russia as scheduled.
The New England Center for Investigative Journalism said the men had tourist visas and had already held a workshop in Moscow.