ISIS seized Mosul in 2014 and it is now the last urban center in Iraq controlled by the group.
Centers in 10 states reported phoned-in threats, while in Missouri more than 100 headstones were found toppled over or damaged at a historic cemetery.
Witnesses described the plane exploding on impact and erupting into a "massive fireball."
Lohan had been returning from Turkey, where she recently met President Erdogan, and was wearing the headscarf out of 'personal respect.'
Migrant deaths have risen to record levels on the Libya-to-Italy smuggling route across the Mediterranean Sea.