New York Times reporter and ISIS expert Rukmini Callimachi tweeted this must-read threat on Thursday where she explains how ISIS was able to influence Sayfullo Saipov, the suspect in this week’s terror attack in New York City.

“He followed ISIS’ instructions to the letter”:

No remorse:

Planned for a year:

And the attack was on the one-year anniversary of this speech by ISIS leader Baghdadi:

According to the complaint, Saipov started planning how to use a truck in an attack 2 months ago:

And that he chose Halloween to inflict “maximum damage against civilians”:

Here are the detail of the ISIS connection:

Now, here’s the important question: Who helped him get these videos?

As for why ISIS hasn’t claimed credit yet, that’s actually to be expected since the suspect is still living and in custody:

Details here: