A coordinated effort to intimidate:
Mr. Feinstein said about 300 people had been in the Rockville center when the threat was made, including about 200 preschoolers. After the threat in Delaware, parents were called to pick up preschool and day school students. In South Carolina, Mr. Abels said staff members and patrons attending exercise classes had to leave. About three hours later, he said, the authorities said it was safe to return, leaving many to wonder what had happened.
“It could be anything from hate groups to a terrorist situation,” Mr. Abels said. “I think it’s probably more on the hate group side, because it was just a scare.” He said he believed it was “designed to be psychologically disorienting and scary and just disruptive.”
It was not a single individual making these phone calls, both an elderly-sounding female and at least one male took part. Some 16 community centers spanning the Eastern seaboard were targeted, and I'm not so sure this was just a fear tactic. It could have provided a potential attacker(s) with the evacuation patterns of one or more facilities, revealing when/where they would be grouped together outside and most vulnerable to a shooter (see photo). And the multiple threats could also be an effort to mask the targeting of one specific facility, to avoid localized scrutiny by law enforcement. Whatever the case, it should not be dismissed as merely a telephone prank and/or harmless ranting.