A team of U.S. investigators is speaking with the parents of the two Boston bombing suspects in southern Russia.
A U.S. Embassy official said the Americans traveled from Moscow to the predominantly Muslim province of Dagestan "because the investigation is ongoing, it's not over."
The official, who spoke on condition of anonymity because he was not authorized to speak to the media, said Wednesday that the team is working with the Russian security services, the FSB.
The mother of Tamerlan and Dzhokhar Tsarnaev is being interviewed Wednesday in the FSB building in Makhachkala, the capital of Dagestan.
The official said one positive development from the Boston tragedy might be closer cooperation with the Russian government on security issues.