A report from Turkey's National Police Department found that 80 percent of guns seized by police from 2010 to 2012 were unregistered.
One man was arrested and two others were being sought in an alleged plot to assassinate Ecumenical Orthodox Patriarch Bartholomew, prosecutors in Turkey said.
The move from Turkey by Kurdish militants could make the situation in northern Iraq worse than it is, Iraqi officials said.
The European Union welcomes Turkish efforts to bring peace to the country's southeast, EU Ambassador to Turkey Jean-Maurice Ripert said.
Militants with the Kurdistan Workers' Party have begun withdrawing from Turkey in a settlement process designed to bring peace to the country, officials say.
Turkish intelligence officials are monitoring the withdrawal of fighters from the separatist Kurdistan Workers' Party, the deputy prime minister said.
Turkish fighters with the Kurdistan Workers' Party need to leave their weapons behind as they leave the country, the Turkish prime minister said Tuesday.
Turkish and Israeli officials are sorting out details of financial compensation offered in response to a deadly flotilla raid in 2010, a diplomat said.
Two Turkish passenger ferries collided in a dense fog on the Bosporus Strait, injuring three passengers, officials said.
Two Turkish soldiers died when one of them stepped on a land mine near Agri in eastern Turkey, officials said.