MADRID -- The head of the Spanish office of an international aid group says they have had no contact with their two workers who were kidnapped from an East African refugee camp.

Doctors Without Borders head Juan Antonio Bastos on Friday identified the women who were kidnapped Thursday as Montserrat Serra i Ridao, 40, from Girona in northeast Spain and Blanca Thiebaut, 30, from Madrid.

Kenyan security forces on Friday found their vehicle abandoned and mired in the desert. They had been headed toward neighboring Somalia.

The abduction prompted aid agencies at the Dadaab refugee camp to scale back relief operations.

In recent months, tens of thousands of refugees fleeing a spreading famine in southern Somalia have swollen the severely overcrowded camp near Kenya's border with Somalia.