PARKLAND, Fla. -- As families began burying their dead, authorities questioned whether they could have prevented the attack on a South Florida high school where a gunman took the lives of 14 students, the athletic director, a coach and a geography teacher. At funerals and in the streets of Parkland, a suburb on the edge of the Everglades, anger bubbled over at the senselessness of the shooting and at the widespread availability of guns. A rally to support gun-safety legislation was taking place Saturday at the federal courthouse in Fort Lauderdale.

During a funeral Friday for 18-year-old Meadow Pollack, her father looked down at his daughter's plain pine coffin and screamed in anguish as Gov. Rick Scott and 1,000 others sat in Temple K'ol Tikvah.

"You killed my kid!" Andrew Pollack yelled, referring to Nikolas Cruz, who is accused of gunning down Meadow and 16 others. "My kid is dead. It goes through my head all day and all night. I keep hearing it. This is just unimaginable that I will never see my princess again."

He briefly paused as mourners, punched by the rawness of his words, began to wail.

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"I wasn't able to do anything about it. I have always been able to protect my family," he said. "Our kids should be safe."

Not long after that funeral, the FBI said it received a tip last month that Cruz had a "desire to kill" and access to guns and could be plotting an attack, but agents failed to investigate. The governor called for the FBI director to resign.

A person who was close to Cruz called the FBI's tip line on Jan. 5 and provided information about Cruz's weapons and his erratic behavior, including his disturbing social media posts. The caller was concerned that Cruz could attack a school.

In a statement, the agency acknowledged that the tip should have been shared with the FBI's Miami office and investigated, but it was not. The startling admission came as the agency was already facing criticism for its treatment of a tip about a YouTube comment posted last year. The comment posted by a "Nikolas Cruz" said, "Im going to be a professional school shooter."

The FBI investigated the remark but did not determine who made it.

On Friday, Florida's Republican Gov. Rick Scott called on FBI Director Christopher Wray to resign.

"The FBI's failure to take action against this killer is unacceptable," Scott said. "The FBI has admitted that they were contacted last month by a person who called to inform them of Cruz's 'desire to kill people,' and 'the potential of him conducting a school shooting.'

"Seventeen innocent people are dead and acknowledging a mistake isn't going to cut it," Scott continued. "An apology will never bring these 17 Floridians back to life or comfort the families who are in pain. The families will spend a lifetime wondering how this could happen, and an apology will never give them the answers they desperately need."

Attorney General Jeff Sessions said the shooting that killed 17 people Wednesday was a "tragic consequence" of the FBI's missteps and ordered a review of the Justice Department's processes. He said it's now clear that the nation's premier law enforcement agency missed warning signs.

In more evidence that there had been signs of trouble with Cruz, Broward County Sheriff Scott Israel said his office had received more than 20 calls about him in the past few years. He said each call would be "looked at and scrutinized" and that he would take appropriate action should he learn his office fell short in handling them.

Cruz was being held without bail at the Broward County Jail on 17 counts of first-degree murder.

Authorities have not described any specific motive, except to say that Cruz had been kicked out of the high school, which has about 3,000 students and serves an affluent suburb where the median home price is nearly $600,000. Students who knew him described a volatile teenager whose strange behavior had caused others to end friendships.

News of law enforcement's admissions enraged those in the community.

"The FBI has failed," said Lewis Mizen, a 17-year-old student at Marjory Stoneman Douglas High School, where the attack took place. "It's going to be a mark on their name forever. Their mistakes have cost the lives of 17 people. There are people dead because they failed in their jobs."

Across the internet, students who were caught in the crossfire at the school spoke out. Some took politicians to task on Twitter.

David Hogg, a survivor of the attack, is telling politicians and Americans in a poignant essay written for CBS Sunday Morning that they must to do something to stop the next school shooting.

"Politicians and more importantly the American public must take action if we're going to prevent the next shooting," Hogg says.

"To elected officials I say this: Don't lie to us. Don't make any more false promises, because when you do, children die," he adds.

One student asked President Donald Trump to meet with her. Some teens have been critical of Mr. Trump for failing to mention guns in his comments about the attack.

On Friday evening, Mr. Trump visited a Florida hospital where he greeted medical staff and thanked the doctors, nurses and first responders who helped the shooting victims. He told reporters he also met with some of the victims who are still hospitalized. He later met with members of the Broward County Sheriff's office and local law enforcement, including Coconut Creek Police Officer Mike Leonard, who said he was the one who apprehended Cruz.

Sidney Fischer, a junior who was in a Holocaust history class when the shooter aimed his gun at the window and shot into the room, went on Reddit on Friday to recount his harrowing experience and answer questions. Two students in his classroom died, and one of the slain students, Joaquin Oliver who went by the nickname 'Guac,' had just been transferred into his algebra class.

"I can't believe that when I go back to school, his seat will be empty and life will just go on," Fischer wrote.