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The female suicide bomber who blew herself up in a crowded public transport hub in Ankara on Sunday, killing 37 people, has been identified as a 24-year-old Kurdish separatist

Seher Cagla Demir was a members of the Kurdistan Free Hawks (TAK), who became a rebel in 2013 and had trained in Syria, before carrying out the suicide blast on the Turkish capital.

In a statement on its website, TAK named the woman bomber as Seher Cagla Demir, who had been involved since 2013 in a 'radical fight against a policy of massacre and denial against the Kurdish people.'

'On the evening of March 13, a suicide attack was carried out... in Ankara, the heart of the fascist Turkish republic,' the statement said. The group also posted a picture of the 24-year-old woman online.

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Bomber: Seher Cagla Demir , 24, was a members of the Kurdistan Free Hawks (TAK), who became a rebel in 2013 and had trained in Syria, before carrying out the suicide blast in Ankara on Sunday, killing 37 people

Rebel: Turkish media have released video of Demir attending a May Day march with pro-Kurdish BD Party

Clash: Labour Day marches are traditionally politically charged with demonstrators often clashing with police

It comes as Germany closed its embassy in Ankara and its general consulate in Istanbul due to indications that an attack could be imminent while a German school in Istanbul was also shut due to an 'unconfirmed warning'.

TAK leaders, describing Demir as the first female suicide bomber in its ranks, took responsibility for the bombing earlier this week - and said it would attack security forces again.

The Turkey-based Kurdistan Free Hawks (TAK) group is considered an offshoot of the Kurdistan Workers' Party, or PKK, and has carried out several attacks in the past including one in Ankara in February that killed 29 people.

Turkish media have published a video footage purportedly of Demir at a May 1 Labour Day protest in 2013.

She is seen joining hands with fellow protesters in a traditional Kurdish dance casually dressed in a t-shirt and jeans.

In a second video she is seen marching in the street carrying a poster that proclaims 'Long live socialism', in Kurdish.

Additional photographs published by the Turkish press show her wearing a yellow, green and red headband - colours synonymous with Kurdish independence.

It comes as Germany closed its embassy in Ankara and its general consulate in Istanbul due to indications that an attack could be imminent while a German school in Istanbul was also shut due to an 'unconfirmed warning'.

TAK had previously claimed responsibility for a car bombing in Ankara last month that killed 29 people.

Ankara has now been hit by three bombings in a space of five months, ratcheting up security fears across the city and Turkey.

In a statement posted online, the group described the latest car bombing as revenge for security operations in the mainly Kurdish southeast that have been under way since July, in which hundreds of civilians, security forces and militants have been killed.

TAK said it had not intended to kill civilians and was targeting security forces.

It said a large number of civilians had been killed after police intervened, without explaining exactly how, and warned that further civilian deaths were 'inevitable'.

The Kurdistan Free Hawks said it carried out the suicide blast on Sunday at a crowded public transport hub in the city - and said it would attack security forces again

The Turkey-based Kurdistan Free Hawks is considered an offshoot of the Kurdistan Workers' Party, or PKK

A woman cries over the coffin of a car bombing victim during a commemoration ceremony in a mosque

Relatives of Feyza Acisu one of the victims who was killed in an explosion cries during the funeral in Ankara

Turkish Prime Minister Ahmet Davutoglu puts a Turkish flag to the place where the terror attack took place

TAK says it split off from the outlawed Kurdistan Workers' Party (PKK), although experts who follow Kurdish militants say the groups retain ties.

At least 40,000 people have been killed since the PKK began its fight for Kurdish autonomy in the southeast three decades ago.

The increased violence in Turkey has also put strain on the NATO member's relationship with the United States, which is supporting a Syrian Kurdish militia, the YPG, in the fight against ISIS in Syria.