'We owe it to our children and our teachers to keep them safe while at school, ' she tweeted.
He regretted that he did not say goodbye to his daughter when she left for school that morning and urged parents to hug and kiss their children every day and to tell them they love them.
The Miami Herald, an East Coast paper from the state of Florida, led with: "The 17 Lives Lost at Douglas High".
Trump said Thursday he planned to head to Parkland "to meet with families and local officials and to continue coordinating the federal response" but the White House had yet to confirm details of his visit at the time of Trump's tweet.
The White House is still collectively working through how to best strike a "comforter in chief" tone after a year in office, this official conceded.
President Trump has already sent his "prayers and condolences" but for many people, it's not enough.
The late-night host - the only one who wasn't pre-empted this week for the Olympics - gave a similar emotional speech in October after the Las Vegas massacre at the Route 91 Harvest festival.
The president had tweeted earlier that he would meet with people "whose lives have been totally shattered". Trump canceled an event scheduled for Friday in Orlando, but is still set to spend the weekend at Mar-a-Lago, which is about 40 miles from Parkland.
My fellow Americans, today I speak to a nation in grief.
Trump and first lady Melania Trump came to Broward Health North Hospital to pay their respects to the medical professionals who had responded to the shooting in nearby Parkland. The FBI said Thursday that in 2017 after receiving a tip, it had investigated a YouTube comment that stated "I'm going to be a professional school shooter". Several leading Republicans, however, suggested Congress should offer more than "thoughts and prayers".
The suspect, Nikolas Cruz, 19, carried a black duffel bag and backpack, where he hid loaded magazines, the report said.
As the Democrats push for expanded background checks, congressman Mike Thompson called the lack of action against gun violence "appalling".
My outrage about the killings of students and staff members at Marjory Stoneman Douglas High School can not be described.
The profile photo on Cruz's Instagram account showed a masked face wearing a "Make America Great Again" hat like those associated with Trump's campaign.
"My friends are dead", one student said.
The suspected shooter bought the firearm in the past year and had passed the background check to make the purchase, according to a U.S. official briefed on the investigation.