The Russian Foreign Ministry is looking into a U.S. report on the arrest of a group of suspected Russian spies and considers the report controversial, the ministry's press office said.
"The reports require further clarification," a spokesman said without providing any further details.
The U.S. Department of Justice said in a statement on Monday that 11 people had been charged as "unlawful agents of the Russian Federation within the United States."
Eight of the suspects were arrested on Sunday as allegedly being deep cover Russian agents in the United States. Two others were arrested for allegedly participating in the same Russian intelligence operation, while one suspect remains at large.
MOSCOW, June 29 (RIA Novosti)
