Berlin also said it would review Turkish applications for arms projects.

In Turkey, ministers lashed back, with Cavusoglu accusing Germany of maintaining an "unacceptable, one-sided" attitude. He said that threats and blackmail would find no answers in Turkey, but also maintained a more mellow tone pointing out that the two countries needed to focus on their long-term goals.

For his part, Turkey's presidential spokesman Ibrahim Kalin slammed Germany as "great political irresponsibility" in stepping up its travel warning. He pointed out that millions of Germans were fully safe visiting Turkey and those under judicial prosecution were only a handful of German nationals.

President Erdogan told his country in a speech on Friday to "pull itself together," and said that "Germany cannot scare Turkey with threats."

Erdogan also strongly denied reports that some German companies were investigated by Turkish judges for suspected terrorist links.

The German Bild newspaper asked in a rather cynical mood if "Erdogan would also arrest (German) tourists" in Turkey, which is a major destination of millions of Europeans each summer.

Some 3 million Turks live in Germany for many decades as they immigrated as workers, and trade volume is also big between the two countries.

"This is probably the biggest crisis in modern times between the two countries," said Hakan Celik, a political commentator on cnn Turk news channel.

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