Russian authorities are preparing to send home a US aid worker who was reportedly held hostage by Chechen rebels.
Kenneth Gluck, head of the Doctors Without Borders mission for Chechnya, was being questioned in military headquarters in Khankala after Russian commandos helped rescue him.
It was unclear how long Mr Gluck would stay in Nazran, where Doctors Without Borders has an office.
Details of his captivity and the circumstances of his abrupt release remain unclear.
He was seized on January 9 by masked gunmen who pulled him from his car near the town of Stariye Atagi in the southern foothills of Chechnya.
The Federal Security Service, or FSB, said he was released unharmed in a special operation.
The FSB is leading the Russian campaign against Chechen rebels, now in its sixteenth month.
Chechen president Aslan Maskhadov claimed Russian secret services were behind Mr Gluck's kidnapping.
He was abducted in an area thick with Russian checkpoints, which some observers said cast doubt on the claim rebels were responsible.