President Trump in an address to the nation Thursday called the Florida school shooting that left 17 people dead and another 15 wounded a moment of "hatred and evil".
Trump lamented in a tweet that there were "So many signs that the Florida shooter was mentally disturbed, even expelled from school for bad and erratic behavior".
The president also put the onus on "neighbors and classmates" who knew about his troubles, tweeting that they "must always report such instances to authorities, again and again!"
A survivor of Wednesday's Florida massacre hit out at President Donald Trump after the US leader offered his "prayers and condolences" to families of the victims of the high school shooting that left at least 17 adults and children dead.
Trump was speaking publicly for the first time after a 19-year-old man with a troubled past allegedly opened fire at Marjory Stoneman Douglas High School in Parkland, Fla., killing 17 students and faculty and wounding 15 others.
The Broward County sheriff and schools superintendent Robert Runcie urged officials to do more to improve school security.
Early Thursday, Cruz was booked on 17 counts of "murder premeditated".
"Soon teachers and students got the word: It was a code red".
Officials said they're dissecting the suspect's disturbing social media posts, without elaboration.
Melissa Falkowski, a teacher at Marjory Stoneman Douglas High School, told CNN's Anderson Cooper she felt the government had "failed" students.
Cruz's mother Lynda Cruz died of pneumonia on November 1, neighbors, friends and family members said, according to the Sun Sentinel.
The comment, made by a user named Nikolas Cruz, stated: "I'm going to be a professional school shooter".
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"Do something instead of sending prayers".
Trump's aides are in the initial planning stages of a visit to the Parkland community over the weekend when he's staying at Mar-a-Lago, less than 50 miles away from the shooting scene, the official said.
Ben Bennight, a 36-year-old YouTube video blogger from MS, noticed in September an alarming comment on a video he'd posted.
She said the teacher was an awesome person and his memory would live on with her.
The boys were left in the care of a family friend after their mother died, said family member Barbara Kumbatovich, of Long Island. "Later this month, I will be meeting with the nation's governors and attorneys general where making our schools and our children safer will be our top priority".
Shooting suspect Nikolas Cruz was initially taken by ambulance to Broward North hospital for treatment for labored breathing after his arrest.
According to reports Mr Cruz told the family he was staying with that he did not want to go to college because it was Valentine's Day. "The cops are all over", they said.
"You keep your eyes on those kids who become disconnected - you know, they're out on the fringes". Photos posted in an Instagram account linked to Cruz show a half-dozen weapons displayed on a mattress and a box of ammunition.
Hearing loud bangs as the shooter fired, numerous students hid under desks or in closets, and barricaded doors. "You don't think it will ever happen to you and your children". The students called Cruz "weird" and a "loner" - even those who'd been friendly with him said they hadn't seen him in more than a year since his expulsion. Authorities believe Cruz killed three people before entering the school and 12 inside the building.
The 19-year-old was charged Thursday morning.
This is at least the third school shooting this year, and one of the deadliest on record.
Cruz has been charged with 17 counts of premeditated murder following the deadly shooting, the worst at a U.S. school since 2012.