Ban "condemns today's terrorist attack" and "expresses his deepest sympathy and condolences to the families of the victims and to the government and people of Turkey," his spokesman said in a statement.
The UN chief "stands firmly by Turkey as it confronts this threat and stresses the need to intensify regional and international efforts to combat terrorism and violent extremism."
"The Secretary-General hopes that the perpetrators of this crime will be identified and brought to justice," the statement said.