An explosion ripped through a central square in Istanbul Tuesday, killing at least 10 people and wounding 15 others, the Istanbul governor’s office said. Officials said the toll may include foreign nationals.
The city’s Sultanahmet Square was swarming with security forces and ambulances in the aftermath of the blast. The heavily guarded area is Istanbul’s tourist hub — the cultural and historic heart of the city. The Blue Mosque and Hagia Sophia are located there.
“Investigations continue about the explosion’s cause, the explosive’s types, the perpetrator or perpetrators of the event,” said Istanbul governor Vasip Sahin.
No group immediately claimed responsibility and the identities of the dead and wounded weren’t released.
“It cannot be ruled out that German citizens have become victims in the explosion,” the German ministry of foreign affairs said.
Germany’s Foreign Office issued a travel advisory following the blast. Turkey is a popular destination for German tourists.
“Travelers in Istanbul are urged to avoid larger gatherings, also in public squares and to avoid tourist attractions for now,” a statement said.
“Seems to be an attack of some kind’
The blast comes as Turkey deals with multiple threats to its security.
“This does seems to be an attack of some kind,” said Sajjan Gohel, international security director at the Asia Pacific Foundation. “There’s been concern in Turkey for a while. Turkey’s been on higher alert.”
ISIS and the Kurdish group PKK have been mentioned in recent outbreaks of violence.
In October, two explosions hit a lunchtime peace rally in Ankara, which called for an end to the renewed conflict between the Kurdistan Workers’ Party, or PKK, and Turkish government. More than 100 people were killed and more than 240 were injured.
ISIS is active in neighboring Iraq.
The Turkish government allows the United States to launch strikes on ISIS positions from Incirlik Air Base in southern Turkey.
“The Islamic State has been unhappy with Turkey’s cooperation with the United States,” said Fadi Hakura, associate fellow at Chatham House.
Kurdish forces have been battling ISIS across a swath of northern Iraq and Syria.