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Ahead of the Kurdish new year, some 30,000 demonstrators from across Germany gathered to demand democracy and a No vote in Turkey’s referendum on increasing presidential powers next month. Many protesters carried symbols of the Kurdistan Workers’ Party (PKK), which is considered by Turkey to be a terrorist organisation.

Turkey condemned the protest as “unacceptable”, and criticised Germany for allowing it. Tensions between the two nations have been rising since Germany refused to allow Turkish ministers hold pro-government rallies in the country a fortnight ago. President Erdogan’s spokesman Ibrahim Kalin said: "It is unacceptable to see PKK symbols and slogans when Turkish ministers and lawmakers are being prevented from meeting their own citizens.

GETTY The development comes amid increasing tensions between the two nations

GETTY Some 30,000 demonstrators came from across Germany to protest Erdogan's presidency

"We once again remind European countries: on April 16 the decision is to be made by the Turkish nation, not Europe." The PKK launched an insurgency against the Turkish state in 1984. More than 40,000 people have been killed over 33 years of fighting between the two groups.

GETTY Erdogan's presidential powers will be greatly increased if he wins the referendum next month

A look back on the shocking Turkish military coup that left 294 dead Wed, July 27, 2016 The violent military coup to overthrow Turkey's President Erdogan has 'failed' leaving at least 104 dead and more than 1,500 wounded Play slideshow Getty Images 1 of 42 A police officer talks with the soldiers involved in the coup attempt after they surrendered

Around 1.4 million Turkish nationals in Germany are eligible to vote in net month’s referendum. The vote could give Erdogan unprecedented control over Turkey’s budget and the appointment of ministers and judges, as well as the power to dismiss parliament.