Have they struck again? A huge blast struck Sultanahmet Square this morning in the city’s downtown, home to many popular tourist attractions. The explosion killed at least 10 people — nine of them German tourists — and wounded 15. Turkish officials say the attacker was a Syrian suicide bomber they believe was a member of ISIS. Prime Minister Ahmet Davutoglu called German Chancellor Angela Merkel to offer his condolences and has promised to punish anyone linked to the bombing. But his nation must also grapple with the impact this will have on its tourist trade, a substantial proportion of which is generated by German visitors.