At least 10 were killed and 15 injured in a blast in an explosion in the heavily traveled tourist area of Istanbul, Turkey, on Tuesday.
Officials have already ruled the blast a likely terror attack, but no group has yet claimed responsibility, Fox News reported.
"Terrorist links are suspected," one official told Agence France-Presse.
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It's not clear who is among the dead, but local government sources say some could include foreign nationals, CNN reported. Germans, especially, flock to the country for vacations.
"It cannot be ruled out that German citizens have become victims in the explosion," the German ministry of foreign affairs said, in a statement. "Travelers in Istanbul are urged to avoid larger gatherings, also in public squares and to avoid tourist attractions for now."
Security swarmed to the city's Sultanahmet Square, carting dead and wounded in several ambulances. The area is the center of the city's tourist section and home to much of its cultural and historic points of interests.
It didn't take long for social media posters to catch the news.
"Terrorism kills again in Turkey," wrote one, Sabine Freizer Gunes, on Twitter. "Last suicide bomber in Sultanhamet was a female pro ISIS Dagestani. 1st time in many yrs tourists targeted."
In October, separate explosions hit a peace rally in Ankara, killing 99 and wounding more than 240.
"The Islamic State has been unhappy with Turkey's cooperation with the United States," said Fadi Hakura, an associate fellow with the Chatham House, in CNN.