A crowd has attacked the headquarters of Turkey's pro-Kurdish HDP party, amid rising violence between Turkish forces and the militant Kurdish PKK group.
Pictures from the scene appeared to show the HDP building in the capital, Ankara, on fire.
Prime Minister Ahmet Davutoglu has appealed for calm.
Earlier, Turkish ground forces crossed into Iraq in pursuit of Kurdish militants for the first time since a ceasefire with the PKK two years ago.
Turkish warplanes also launched a wave of air strikes on bases of the PKK (Kurdistan Workers' Party) in northern Iraq.
Image copyright Reuters
Image caption Nationalist groups shouted slogans during a protest in Istanbul on Tuesday
Nationalists staged rallies across Turkey on Tuesday, hours after 14 police officers were killed in a suspected PKK bomb attack on a minibus in the east of the country.
The bombing came a day after another militant attack on the Turkish military killed 16 soldiers.
Newspaper attacked
HDP (Peoples' Democratic Party) lawmaker Garo Paylan told Reuters news agency that hundreds of protesters had attacked the building in Ankara.
"Police are just watching, he said. "What's being broken there is our hope of living together."
In Istanbul, pro-government protesters again attacked the offices of the Hurriyet newspaper, smashing windows. An angry crowd had stormed the building on Sunday accusing the newspaper of misquoting President Recep Tayyip Erdogan in a TV interview.
Mr Davutoglu took to Twitter to denounce the attacks.
More:
http://www.bbc.co.uk/news/world-europe-34193733My Kurdish friends are not exactly happy right now.
