The warnings that law enforcement officials received about Nikolas Cruz were anything but subtle.
“I know he’s going to explode,” a woman who knew Mr. Cruz said on the F.B.I.’s tip line on Jan. 5. Her big worry was that he might resort to slipping “into a school and just shooting the place up.” Forty days later, Mr. Cruz is accused of doing just that, barging into his former high school in Parkland, Fla., and shooting 17 people to death.
Three months before the Feb. 14 massacre at Marjory Stoneman Douglas High School, a family friend dialed 911 to tell the Palm Beach County sheriff’s office about Mr. Cruz’s personal arsenal. “I need someone here because I’m afraid he comes back and he has a lot of weapons,” the friend said.