At first, the statement seemed to fit a recent pattern of pressure on humanitarian aid groups. In Moscow, Russian officials have shut down foreign-financed humanitarian aid organizations like the United States Agency for International Development and Unicef.

But aid groups active in the Ingushetia region in southern Russia, where the 20 nongovernmental organizations are said to be located, said not one had been closed in recent months, for any reason. The disconnect, they said, illustrates the eerie way the security agency, a successor to the K.G.B., sometimes operates.

Tanya ...