“Motive unclear” says the Magic 8 Ball of PC criminal investigations.
The proper police response should be: “We presume this is a radical Islamist terror attack until we prove otherwise. All Americans should be vigilant”.
Motive unclear? Unclear to whom?
The motive is jihad against non-Muslims in the territory once known as “the United States of America”.
There are several ways this terrorization may be contained or reduced. One is to cut all the “political correctness” and declare this assault for what it is - urban guerrilla warfare.
Just as despicable as the Weather Underground or the Symbionese Liberation Army, campus-based leftist radicals that declared war on the rest of America.
Another would be to do just as The Donald proposed, shut down ALL movement of Muslims from anywhere into the US. Any Muslims who want to enter the US should be diverted to some island offshore and kept there until they may be FULLY vetted, and their intentions while within American jurisdiction are all lawful and in compliance to the Federal and local laws in the locations they claim is their destination.