Marib (South24) 

The international humanitarian aid group "Doctors Without Borders/Médecins Sans Frontières" announced earlier today that it had lost contact with two of its employees in Yemen.

The organization said in a statement, reported by Reuters, that the employees, from Germany and Myanmar, are in the Marib governorate in central Yemen.

The organization added that it would not share further details out of concern for the workers' safety.

Local media quoted a security official in Marib as saying that gunmen kidnapped the two employees on a desert road linking Marib and Hadramout.

The official did not specify when the incident occurred. He said efforts were underway to locate the hostages.

The incident comes half a month after the liberation of 5 United Nations employees, a year and a half after they were kidnapped by AQAP in Abyan governorate.

The employees arrived in the capital, Aden, after their release, in an operation in which the Southern Transitional Council and the UAE contributed.

Related: The STC Contributes to the Return of 5 UN Employees to Their Families