Gunmen in Yemen have kidnapped two foreign employees of Medecins Sans Frontieres (Doctors Without Borders) in the eastern Hadramout governorate, a security source and two other local sources said. The medical charity told Reuters it had lost contact with some of its staff in Yemen and that it could not share more details at this time out of concern for their safety. The security source said the employees were a German and a Mexican and were taken from their car by gunmen that security forces believed to be linked to Al Qaeda in the Arabian Peninsula. Islamist militant groups are among many des…