Four German police officers were wounded, one of them critically, when a member of the shadowy far-right group "Citizens of the Reich" opened fire during a raid Wednesday, authorities said.

Berlin said Thursday that Ankara will allow German lawmakers to visit a NATO airbase near Syria after refusing access amid a months-long row over Germany recognizing the World War I-era massacre of Armenians as "genocide."

Germany on Tuesday dismissed a Turkish threat to renege on a controversial EU deal on stemming the flow of migrants if it is not granted visa-free travel by October.

Asked if Turkey could "blackmail" the EU over the refugee pact, German Foreign Minister Frank-Walter Steinmeier told the Rheinische Post newspaper: "That is absurd."

The 18-year-old gunman who killed nine people in a shooting spree in Munich had been planning his crime for a year but chose his victims at random, officials said on Sunday.

Germany on Wednesday condemned Turkey's escalating crackdown following a failed coup, saying the hardline response "flouts the rule of law".

"Nearly every day we are seeing new measures that flout the rule of law and that disregard the principle of proportionality," government spokesman Steffen Seibert told reporters.

The Islamic State group Tuesday released a video purportedly featuring a 17-year-old Afghan refugee who went on an ax rampage on a German train, injuring five people, two critically.

The video showed teenager "Mohammed Riyadh" -- knife in hand -- announcing in Pashto he would carry out an "operation" in Germany, and presenting himself as a "soldier of the caliphate."

German Chancellor Angela Merkel expects Britain's new government to "quickly" define its relationship with the European Union after conservative Theresa May becomes prime minister on Wednesday.

Turkey said Monday it would allow Germany's defense minister to visit an air base in the south of the country after sparking a row by barring a German delegation from making the trip.

Investors on Tuesday started paying for the privilege of owning rock-solid German government bonds as fears of a possible Brexit and economic worries caused a rush to the safety of German debt.

Germany's foreign ministry on Tuesday asked in the Turkish charge d'affaires over the row sparked by a German parliamentary vote declaring the Ottomans' World War I massacre of Armenians a genocide.

German parliamentarians of Turkish origin have received death threats over the vote, while Turkish President Recep Tayyip Erdogan has accused them of backing "terrorism".