Ankara, angered by a resolution passed by Germany's parliament in June that terms the 1915 massacre of Armenians by Ottoman forces as genocide, has denied German MPs access to the Incirclik base.

"The German army answers to parliament," Social Democrat leader and Deputy Chancellor Sigmar Gabriel told the regional newspaper "Mitteldeutsche Zeitung."

"And if parliament cannot visit its army, then the army cannot stay there. This is absolutely clear," Gabriel said, adding that all 250 soldiers at the base - part of NATO operations against "Islamic State" (IS) militants in Iraq - could be pulled out.

Crucial partners in efforts to stem mass migration to Europe, Germany and Turkey have fallen out in recent months, with Turkish President Recep Tayyip Erdogan angry over various satirical broadcasts targeting him on German television, most notably an insulting "poem" by comedian Jan Böhmerrmann. The Armenian resolution, which prompted Ankara to recall its ambassador to Germany, has deepened the rift.

Vice Chancellor Sigmar Gabriel.

German forces are currently on missions in 13 countries, including Afghanistan and Kosovo, as well as monitoring in the Mediterranean.

Chancellor Angela Merkel said on Tuesday that German MPs must be allowed to visit soldiers at the base, adding that she would try to resolve the issue with the Turkish government.

Chairman of the Armed Forces Association Andre Wüstner also warned against withdrawing German troops from Incirlik. "It is completely clear that MPs need to be allowed to travel," Wüstner said on Wednesday as published in the ARD "Morning Magazine."

A withdrawal of German soldiers fighting IS would be "extremely detrimental," Wüstner added.

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jbh/jil (Reuters, dpa)