I say go with mecca but give them fair warning.
One more attack that can be traced to muslim extremism and it's by,by mecca.
If you retaliate in any way say adios to tehran....wash rinse repeat.
It is well past the time to show strength to deal with bullies. Well past the time to round up Muslims sympathetic to ISIS. Well past the time to close and lock up all mosques, because they are all recruitment centers for ISIS. Well past the time to lock up all imams of said mosques as traitors and agitators to conspire against the country that gave them freedom to spew their hate.
Well past the time to think that Muslims have a sense of decency and fair play. Well past the time that Muslims would ever recognize any religion except the so-called religion that endorses pedophilia, stoning to death, beheadings, whippings and lashings, and death for religious freedom.
Let the bastards experience what people who don't share their faith experience in the hell holes they left behind.