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TOPSHOT - Marjory Stoneman Douglas High School staff, teachers and students return to school greeted by police and well wishers in Parkland, Florida on February 28, 2018. 
Students grieving for slain classmates prepared for an emotional return Wednesday to their Florida high school, where a mass shooting shocked the nation and led teen survivors to spur a growing movement to tighten America's gun laws. The community of Parkland, Florida, where residents were plunged into tragedy two weeks ago, steeled itself for the resumption of classes at Marjory Stoneman Douglas High School, where nearby flower-draped memorials and 17 white crosses pay tribute to the 14 students and three staff members who were murdered by a former student.
 / AFP PHOTO / RHONA WISE        (Photo credit should read RHONA WISE/AFP/Getty Images)
RHONA WISE/AFP/AFP/Getty Images
TOPSHOT - Marjory Stoneman Douglas High School staff, teachers and students return to school greeted by police and well wishers in Parkland, Florida on February 28, 2018. Students grieving for slain classmates prepared for an emotional return Wednesday to their Florida high school, where a mass shooting shocked the nation and led teen survivors to spur a growing movement to tighten America's gun laws. The community of Parkland, Florida, where residents were plunged into tragedy two weeks ago, steeled itself for the resumption of classes at Marjory Stoneman Douglas High School, where nearby flower-draped memorials and 17 white crosses pay tribute to the 14 students and three staff members who were murdered by a former student. / AFP PHOTO / RHONA WISE (Photo credit should read RHONA WISE/AFP/Getty Images)
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This image made available by the Broward County Sheriff's Office on Sunday, Feb. 18, 2018, shows Sheriff Scott Israel, holding the hand of Anthony Borges, 15, a student at Marjory Stoneman Douglas High School. The teenager was shot five times during the massacre on Valentine's Day that killed 17 students. Borges is being credited with saving the lives of at least 20 other students. (Broward County Sheriff's Office via AP)
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This image made available by the Broward County Sheriff's Office on Sunday, Feb. 18, 2018, shows Sheriff Scott Israel, holding the hand of Anthony Borges, 15, a student at Marjory Stoneman Douglas High School. The teenager was shot five times during the massacre on Valentine's Day that killed 17 students. Borges is being credited with saving the lives of at least 20 other students. (Broward County Sheriff's Office via AP)
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(CNN) —  

President Donald Trump offered his prayers and condolences Wednesday as a school shooting in Parkland, Florida unfolded.

The suspect in a deadly high school shooting in Parkland, Florida, is in custody, the Broward County Sheriff’s Office said.

A shooting at Marjory Stoneman Douglas High School Broward caused “numerous” fatalities, Broward County Public Schools Superintendent Robert Runcie said. He did not know the exact number.

Law enforcement responded to reports of a shooting at the school shortly before 3 p.m.

“My prayers and condolences to the families of the victims of the terrible Florida shooting. No child, teacher or anyone else should ever feel unsafe in an American school,” Trump tweeted Wednesday.

Trump also spoke to Florida Gov. Rick Scott and offered federal assistance if needed, according to the White House.

Trump was briefed on the shooting by Homeland Security Secretary Kirstjen Nielsen, who also spoke with Scott and other state and local officials.

On Twitter, the President said the administration is “working closely with law enforcement” in Florida.

White House press secretary Sarah Sanders also told reporters that the previously scheduled White House briefing would be canceled “in light of the tragedy.”

Prior to reports of the shooting, the White House was briefing was already delayed twice from its originally scheduled time.

First lady Melania Trump also tweeted her condolences.

“My heart is heavy over the school shooting in Florida. Keeping all affected in my thoughts & prayers,” she said.