The horses on Buyukada Island were slaughtered after being diagnosed with a fatal equine disease.
The march was launched on June 15 by CHP leader Kilicdaroglu following the jailing of lawmaker Enis Berberoglu, who was sentenced to 25 years in prison for revealing state secrets.
Several thousand people took to the streets of Turkey's two biggest cities on Thursday to protest against a 25-year prison sentence handed down to an opposition lawmaker on spying charges.
Two prominent Turkish journalists working for the newspaper Cumhuriyet are given 5 years prison sentences for revealing state secrets.
Turkey's leftist newspaper Cumhuriyet's editor-in-chief was assaulted by a gunman outside Istanbul's main Caglayan courthouse where he was tried on espionage charges.
Turkish President says Ankara respects freedom of press and freedom of speech, strongly rejecting criticism that there has been increasing suppression of media in Turkey
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