Several Red Cross members whom rebels say they had detained in the eastern Ukrainian city of Donetsk have been released.
"An emergency response team from the local Red Cross and one member of the international Red Cross were detained. They are now all free," said a Red Cross official.
The international staff member is Swiss, the official added.
"We don't know who they were detained by. We are awaiting more information."
Earlier on Saturday, Kiril Rudenko, deputy spokesman for the self-proclaimed "People's Republic of Donetsk", said the Red Cross workers had been detained because the rebels thought they were spies.
"They were arrested yesterday. We suspect they were engaged in espionage and we are currently checking these accusations," said Rudenko.