No one immediately claimed responsibility for the twin explosions that killed at least 12 people and left more than 50 injured.
Demonstrators blame the government for not taking adequate measures to deliver justice for the nearly 270 victims of the bombings and punish the suspects linked the Daesh group.
4 Turkish soldiers were wounded in YPG/PKK attack targeting Turkish military bases in northern Syria on Sunday.
The 15 suspects, nabbed as part of the country's ongoing anti-terror campaign, were foreign nationals, security sources said.
Türkiye's ratification will leave Finland, which shares a long border with Russia, with only a few technical steps before it becomes the 31st member of the world's most powerful military bloc.
Local Afghan community representatives identified the suspect as an Afghan refugee who was known to have psychological problems after his wife died at a refugee camp in Greece.
The Turkish National Defence Ministry says the hosting of the representatives "of the bloody PKK/YPG terrorist organisation" casts a shadow over the respectability of the French Senate.
The helicopters, which carried several PKK terrorists, are said to have been bought by the Talabanis' PUK party with the help of Washington during the Iraq war.
Terror groups such as PKK, Daesh and FETO pose threat to both countries, says Turkish President Recep Tayyip Erdogan.
The charges include terrorism, obstructing police officers in carrying out their tasks, attacks on police, wounding officers and threatening their lives.
The terror attack on two mosques in 2019 by an Australian white supremacist claimed the lives of 51 people and injured many others.
Ankara will fulfil its promise and "run the process" for Finland's NATO membership bid, Turkish President Recep Tayyip Erdogan says.
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