Three people have been killed in an attack on a Turkish publishing house which prints Bibles and Christian literature, according to media reports.
CNN Turk television said the victims' throats had been cut and that police had detained six people in con
Television pictures showed casualties being carried out of the building and one man being restrained by police.
Nationalists had previously held a demonstration outside the publishing house, accusing it of proselytising, the private Dogan news agency reported.
Christian minority
The attack follows the murder earlier this year of Hrant Dink, an Armenian-Turkish editor, by an ultra-nationalist.
Dink's killing prompted extra security measures to be taken for writers and journalists.
The government and other officials in largely Muslim Turkey have in the past criticised Christian missionary work in the country.
The European Union (EU), which Turkey hopes to join, has appealed for more freedom for the Turkey's Christian minority, which comprises less than 1 per cent of the population.
However, some Turkish nationalists see Christian missionaries as enemies of Turkey working to undermine its political and religious institutions.