French and Malian troops are searching for Sophie Pétronin, who ran an NGO helping children suffering from malnutrition, who was kidnapped in the city of Gao in northern Mali on Christmas Eve.
Jacqueline Veyrac was found in a car parked in a district of Nice, bound and with minor injuries, 48 hours after she was kidnapped.
The 30-year-old, who worked as a consultant on a World Bank-funded project, was seized in the capital Sanaa in February.
Isabelle Prime, 30, a consultant for Yemen's Social Fund for Development, appears distressed in the video appeal to French and Yemeni leaders.
Isabelle Prime, 30, who worked for Ayala Consulting on a World Bank-funded project, was the only member of firm's staff left in Yemen.
The 30-year-old woman, who is believed to have ties with the World Bank, was taken by unidentified armed men in the capital Sanaa.
The 67 year-old teacher for her own Catholic ONG was kidnapped in the Central African Republic by Christian militiamen on Monday.
Claudia Priest, 67, a teacher with a Catholic medical NGO in the Central African Reupublic, was kidnapped in the capital Bangui on Monday.
An audacious North Korean kidnap plot is foiled at Paris Charles de Gaulle airport as 'Asian men' attempted to bundle student onto plane.
Report claims that, despite denials, French authorities and other European nations pay out millions over kidnaps that then help finance terrorism.
Paris joins United States and Britain in offering to help rescue more than 200 schoolgirls kidnapped by Islamist militant group Boko Haram.
A French plan to kidnap and kill the extremist cleric was result of frustration at lack of cooperation with UK authorities, a report claims.
Banned Nigerian Islamist group claims it was they who kidnapped Georges Vandenbeusch from his home near Koza in northern Cameroon.