The area, in the Beyoglu district of Turkey's largest city, had been crowded as usual at the weekend with shoppers, tourists and families."Our people can rest assured that the culprits behind the attack will be punished as they deserve," he said, adding that initial information suggested "a woman played a part" in it."It would be wrong to say this is undoubtedly a terrorist attack but the initial developments and initial intelligence from my governor is that it smells like terrorism," Erdogan said.The Kasimpasa police station said all crews were at the scene but gave no further details.The Turkish Red Crescent said blood was being transferred to nearby hospitals."