( CNN ) -- A French engineer who was kidnapped in northern Nigeria has been freed . Francis Collomp was working in the state of Katsina when he was kidnapped in December by a jihadist group calling itself Ansar al-Muslimeen . The French president 's office announced Sunday that Collomp has been released , but did not offer additional information . `` This long-awaited new does not make us forget that seven of our compatriots are still being held hostage in Syria , Mali and Nigeria , '' the office said in a statement . `` France will continue to work tirelessly for their freedom . '' In another development in Nigeria , the military said its soldiers killed 29 suspected members of the Boko Haram terrorist group . The deaths occurred during two shootouts in the country 's Borno state . The U.S. government last week labeled the group a foreign terrorist organization . CNN 's Nana Karikari-apau contributed to this report .
Francis Collomp was kidnapped in December . The French president 's office did not offer additional information .