(PARKLAND, Fla.) -- A football coach and a 14-year-old freshman were among the 17 people killed in a mass shooting at a South Florida high school on Wednesday.
The ages of those killed range from 14 to 49 years old, according to the Broward County Sheriff's Office.
More than a dozen others were injured in the Valentine's Day rampage at Marjory Stoneman Douglas High School.
Here is what we know -- so far -- about the 17 victims:
Martin Duque Anguiano, 14
Martin Duque Anguiano, a 14-year-old freshman, was among those killed. His older brother Miguel, who graduated from the same school last year, wrote on Instagram, "Words cannot describe my pain."
Jaime Guttenberg, 14
Student Jaime Guttenberg was also among the dead.
Her father, Fred Guttenberg, wrote on Facebook on Thursday, "My heart is broken. Yesterday, Jennifer Bloom Guttenberg and I lost our baby girl to a violent shooting at her school. We lost our daughter and my son Jesse Guttenberg lost his sister. I am broken as I write this trying to figure out how my family gets through this."
He added, "Hugs to all and hold your children tight."
Aaron Feis, 37
School football coach and Marjory Stoneman Douglas High School graduate Aaron Feis was one of the 17 killed, Broward County Sheriff Scott Israel said.
The sheriff described Feis as a beloved football coach who was well-known in the local community.
"I coached with him. My two boys played for him," Israel said. "The kids in this community loved him, adored him."
Ryan Mackman of West Palm Beach said he grew up in Parkland and graduated with Feis from Marjory Stoneman Douglas High School in 1999.
"I never thought something like this could happen," Mackman, now 37, told ABC News in a telephone interview Thursday. "The whole community is just stunned."
Mackman said he heard from other former classmates who were close with Feis that he was apparently shot while shielding students from the spray of bullets.
"He was always a really good guy," Mackman said. "But the fact that he died saving lives -- the guy's a hero."
The school's football team wrote on Twitter, "He died a hero and he will forever be in our hearts and memories."
Scott Beigel, 35
Teacher Scott Beigel died while saving others, according to student Kelsey Friend.
Friend told "Good Morning America" that Beigel unlocked a classroom door and started letting students inside.
"I had thought he was behind me," Friend said, adding, "But he wasn't."
"When he opened the door, he had to re-lock it so we can stay safe. And he didn't get the chance to," Friend said, noting that her teacher was lying on the floor.
"I'm so thankful he was there to help everybody," she added.
Gina Montalto, 14
Gina Montalto also died in the shooting, her mother, Jennifer Montalto, said in a Facebook post.
"She was a smart, loving, caring and strong girl who brightened any room she entered. She will be missed by our family for all eternity," the post said.
Nicholas Dworet, 17
Christopher Hixon, 49
Head wrestling coach Christopher Hixon was among the victims, said Coral Springs High School Athletic Director Dan Jacob.
“Chris is probably the nicest guy I have ever met. He would give you the shirt off his back," Jacob said
Alyssa Alhadeff, 14
Alyssa Alhadeff, 14, was among the dead, said her older cousin, Ariella Del Quaglio, who wrote on Facebook, "My heart is broken."
"Alyssa Alhadeff was a loved and well-respected member of our club and community," according to Ryan Block of the Parkland Soccer Club.
"Alyssa will be greatly missed," Block said. "Our thoughts and prayers go out to her family and all the other victims of this tragic event."
Meadow Pollack, 18
Joaquin Oliver, 17
Cara Loughran, 14
Luke Hoyer, 15
Alexander Schachter, 14
Peter Wang, 15
Alaina Petty, 14
Helena Ramsay, 17
Carmen Schentrup, 16
After the shooting, authorities arrested 19-year-old suspect Nikolas Cruz, who had been expelled from the school over disciplinary problems.
The school will be closed the rest of the week.
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