About that mess in New Jersey

Jersey City Mayor Steven Fulop said Wednesday morning that the gunmen targeted the market, with surveillance video showing them driving slowly through the city's streets before stopping outside, calmly exiting their van and immediately opening fire.

"We could see the van moving through Jersey City streets slowly," he said. "The perpetrators stopped in front of (the market), calmly opened the door with two long rifles - him and the other perpetrator - and began firing from the street into the facility."

Fulop stopped short of calling it an anti-Semitic attack, but officials now say the suspects were believed to be followers of the Black Israelites, a group that espouses hatred toward Jews. The group is also known for anti-government and anti-police sentiments.

New Jersey authorities are preliminarily investigating the incident as a case of domestic terrorism.
I'm curious as to why Mr. Mayor stopped short of calling it what it was. 

Note: there's an annoying autoplay of Comrade Mayor speaking at the top.