Turkey has said it will take legal and diplomatic steps in response to a caricature of President Recep Tayyip Erdogan in the French satirical weekly Charlie Hebdo, which officials called a "disgusting effort" to "spread its cultural racism and hatred".
Turkish anger at the cartoon added fuel to a row between Turkey and France about cartoons of the Prophet Mohammad, which flared after a teacher who had shown pupils the cartoons in a lesson on freedom of speech was killed in France earlier this month.
The caricature on the cover of Charlie Hebdo showed Mr Erdogan holding a canned drink along with a woman wearing an Islamic hijab.
"Our people should have no doubt that all necessary legal and diplomatic steps will be taken against the caricature in question," Turkey's Communications Directorate said.
"Our battle against these rude, ill-intentioned and insulting steps will continue until the end with reason but determination," it said in a statement.
Justice Minister Abdulhamit Gul told reporters in Ankara that Turkish authorities had taken all necessary initiatives with the relevant authorities.
State media also reported that Turkish prosecutors had launched an investigation into Charlie Hebdo's executives.
Top Turkish officials had condemned the caricature, with presidential spokesman Ibrahim Kalin saying it had no respect for "any belief, sacredness and values" and showed "their own vulgarity and immorality.
He said the caricature could not be considered freedom of expression.
Turkish presidential communications director Fahrettin Altun said "Macron's anti-Muslim agenda is bearing fruit!"
"We condemn this most disgusting effort by this publicationto spread its cultural racism and hatred," Mr Altun wrote on Twitter.
Mr Erdogan sharply criticised French President Emmanuel Macron at the weekend, saying he needed a mental health check, prompting France to recall its ambassador from Ankara.
On Monday, Mr Erdogan urged a boycott of French products.
The Prophet Mohammad cartoons, considered blasphemous by Muslims, have been displayed in France in solidarity and President Macron has said he would redouble efforts to stop conservative Islamic beliefs subverting French values, angering many Muslims.
The reaction to Mr Paty's murder has caused widespread anger in Muslim countries, where there have been anti-French demonstrations and calls for boycott.
Pakistan's parliament passed a resolution urging the government to recall its envoy from Paris.
France has warned its citizens in several Muslim-majority countries to take extra security precautions.
Meanwhile, Egypt's President Abdel-Fattahal-Sisi has said freedom of expression should stop if it offends more than 1.5 billion people.
Mr Sisi also said he firmly rejects any form of violence or terrorism from anyone in the name of defending religion, religious symbols or icons.
"We also have rights. We have the right for our feelings not to be hurt and for our values not to be hurt," he said during an address to commemorate the Prophet Mohammad's birthday.
"And if some have the freedom to express what is in their thoughts I imagine that this stops when it comes to offending the feelings of more than 1.5 billion people," he added in televised remarks.
UK calls on NATO allies to defend free speech
UK Foreign Secretary Dominic Raab has called on NATO allies to stand shoulder-to-shoulder on values of tolerance and free speech, in a veiled rebuke to Turkey.
Britain, France and Turkey are all NATO members.
"The UK stands in solidarity with France and the French people in the wake of the appalling murder of Samuel Paty," Mr Raab said in a statement. "Terrorism can never and should never be justified.
"NATO allies and the wider international community must stand shoulder-to-shoulder on the fundamental values of tolerance and free speech, and we should never give terrorists the gift of dividing us".
