ISTANBUL (AP) - An explosion killed at least 10 people and injured 15 others Tuesday morning in a historic district of Istanbul popular with tourists, the Istanbul governor's office said.
The cause of the explosion in the Sultanahmet district was being investigated, but state-run TRT television reported it was likely caused by a suicide bomber. A government official, speaking on condition of anonymity because of government rules, said the explosion was believed to be "terror-linked." He did not provide further details.
The explosion, which could be heard from several neighborhoods, was at a park that is home to a landmark obelisk, some 25 meters (yards) from the historic Blue Mosque.
Turkey's Dogan news agency reported that at least six Germans, one Norwegian and one Peruvian were among the wounded, and Seoul's Foreign Ministry told reporters via text message that one South Korean had a finger injury.
Police sealed the area, barring people from approaching in case of a second explosion, and a police helicopter hovered overhead.