PARKLAND, United States (AFP) — Anger boiled over among parents and students in Parkland, Florida on Friday over America’s unwillingness to toughen gun control laws, after a disturbed teenager armed with an assault rifle murdered 17 at the local high school.

With President Donald Trump planning to visit bereaved families in the shocked southern community as early as Friday, a groundswell arose for a new push to restrict the availability of guns and better protect schools.

Lori Alhadeff, whose 14-year-old daughter Alyssa died in Wednesday’s shooting, and who made a powerfully emotional appeal to Trump the following day, addressing a television camera with tears rolling down her face.

“We need action! action! action!” Alhadeff urged in an interview with CNN on Friday, addressing the US leader as the father of an 11-year-old son of his own.

“President Trump, Barron goes to school,” she said. “Let’s protect Barron, and let’s also protect all these other kids here in Parkland, in Florida, and everyone everywhere else in the United States of America,” she said.

“My child is dead. I can’t help her. But I can help all those other kids at Stoneman Douglas High School. We have to protect our children.”

Carly Novell, a senior at the school who survived the shooting, said it was time for politicians to act.

“I just want people to stop, like, talking about it and then not doing anything. People keep, like, saying your thoughts and prayers and all of these things, but it doesn’t make a difference if nothing ever changes.”

Trump tweeted Friday that he planned to meet with victims in the sprawling suburban community about 60 kilometres (35 miles) north of Miami, although it was not yet clear when the meeting would take place.

The US leader is spending the long President’s Day weekend at his Mar-a-Lago resort, a 45 minute drive from Parkland.

“I will be leaving for Florida today to meet with some of the bravest people on earth — but people whose lives have been totally shattered,” he said.

But Trump risked being greeted with angry demands for action on laws that allowed 19-year-old Nikolas Cruz — a 19-year-old who was expelled from Stoneman Douglas and whose behaviour had unnerved acquaintances — to buy an AR-15 semi-automatic assault rifle.

“It’s illogical that the law says a minor can’t have a drink, but can buy a gun,” said Mavy Rubiano, the 47-year-old mother of a student who survived the shooting.

Stoneman Douglas students have taken to social media to blast defenders of the nation’s loose gun laws.

In an eloquent essay published online, 17-year-old Cameron Kasky blasted both Republican and Democratic politicians for not doing anything.

“We can’t ignore the issues of gun control that this tragedy raises,” he wrote.

“And so, I’m asking — no, demanding — we take action now. Why? Because at the end of the day, the students at my school felt one shared experience — our politicians abandoned us by failing to keep guns out of schools.”

In Washington the political response so far makes clear that the powerful National Rifle Association pro-gun lobby — which spent US$30 million to support Trump’s election in 2016 — remains formidable.

On Thursday Trump’s nationally televised address made no mention of guns, or of previous mass shootings.

Trump instead treated the Parkland massacre — the 30th mass shooting of 2018 according to the Gun Violence Archive — as a singular event. He focused on offering sympathies to the families of the victims, on the need to tackle the challenges of mental health.

Republican House leader Paul Ryan, whose campaigns have earned NRA support, said Thursday that it was not a time for arguing over gun control, while Republican Florida Senator Marco Rubio said new gun laws alone would not stop shootings.

As with previous mass shootings, the focus of gun control advocates was on the ready availability of the AR-15, a semi-automatic civilian version of the US military’s standard-issue M16.

The NRA calls the AR-15 “America’s most popular rifle.”

Millions have been sold around the United States — a new one costs as little as US$600. Stephen Paddock, who opened fire on a Las Vegas country music concert on October 1, 2017, killing 58 and wounding hundreds more, had more than a dozen AR-15s.

Devin Patrick Kelley, who shot and killed 26 in a church in Sutherland Springs, Texas on November 5, used an AR-15.

And it was with an AR-15 that 20-year-old Adam Lanza murdered 26 students and adults at Sandy Hook Elementary School in Newtown, Connecticut on December 14, 2012, the deadliest school shooting in US history.