ISTANBUL—Officials have raised concerns that a deadly bombing in southeastern Turkey is part of a campaign of retaliation by the Islamic State group for a recent crackdown on its operations in the country.
If they are right, Turkey would be a particularly vulnerable target for the extremists.
The country shares a 1,250-kilometer (775-mile) border with Iraq and Syria, putting it nearby to strongholds of the self-proclaimed Islamic State. And, as recent arrests show, the extremist group already has established its reach into Turkey.
