ISTANBUL: An explosion killed at least 10 people and injured 15 others on 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 metres (yards) from the historic Blue Mosque.
Police sealed the area, barring people from approaching in case of a second explosion, and a police helicopter hovered overhead.
The Sultanahmet neighborhood is Istanbul's main sightseeing area and includes the Topkapi Palace and the Haghia Sophia museum.
Erdem Koroglu, who was working at a nearby office, told NTV television he saw several people on the ground following the blast.
"It was difficult to say who was alive or dead," Koroglu said. "Buildings rattled from the force of the explosion,"according to Times of India.