At least 44 migrants, including women and babies, were found dead after their vehicle broke down in the desert of northern Niger while on the way to Libya, local officials said Thursday.

"The number of migrants who died in the desert is 44 for now," said Rhissa Feltou, the mayor of Agadez, a remote town on the edge of the Sahara that has become the smuggling capital of Africa.

Only six people who travelled on the truck between the towns of Agadez and Dirkou survived, Lawal Taher, the head of the Red Cross in Niger's Bilma region, told dpa.

The survivors, five men and one woman, had walked until they were rescued near the town of Achigour, said Taher.

A security source who asked not to be named said "the sub-Saharan migrants, including babies and women, died of thirst because their vehicle broke down".

In early May, eight migrants from Niger, five of them children, were found dead in the desert while on their way to Algeria.

Also in May, soldiers on patrol in northern Niger rescued around 40 migrants from various west African countries who had been abandoned in the desert by people-smugglers while travelling to Libya.

The group included citizens of The Gambia, Nigeria, Guinea, Senegal and Niger, all hoping to reach the Libyan coast so they could cross the Mediterranean to Europe.