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A US community devastated by a school shooting one year ago has marked the tragic anniversary with quiet mourning.

Seventeen people were shot and killed by an ex-student at Marjory Stoneman Douglas High School (MSD) in Parkland, Florida on 14 February 2018.

Students and educators across the country also marked the day with vigils, moments of silence, art projects and other demonstrations.

The school mass shooting spurred a renewed effort towards gun control.

How is the event being marked?

Schools in Broward County - the southern Florida region where 14 students and three school staff members were killed - operated on a regular schedule, but students at Marjory Stoneman Douglas held a "non-academic" day devoted to commemoration and healing.

Media playback is unsupported on your device Media caption How 'Parkland tourism' led to this floral memorial

Classes at MSD ended before 14:20 local time, the moment the shooting began a year ago.

"Although we mourn from the lives that we've lost through a horrific act of hate and anger, I believe that we must also celebrate the possibilities of what can be through love and support," superintendent Robert Runcie said outside the school on Thursday.

Schools across the state of Florida held a moment of silence at 10:17 local time, to honour the 17 people killed in the gun attack.

The city of Parkland sponsored a day of service at a park near the school and held a moment of silence, with a vigil later in the evening.

Mental health professional and comfort dogs were there to assist grieving students throughout the day.

Emma Gonzalez, a survivor who became a prominent student activist after the attack, said the gun control advocacy group March for Our Lives would remain silent through the weekend.

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"Like so many others in our community, I'm going to spend that time giving my attention to friends and family, and remembering those we lost," Ms Gonzalez wrote in a statement.

"The 14th is a hard day to look back on. But looking at the movement we've built - the movement you created and the things we've already accomplished together - is incredibly healing."

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'I'll always remember that morning'

Jimmy Tam, BBC News, Parkland, Florida

"I keep missing her," sobs a male student as he pulls away from an embrace. His friend was killed in the shooting. He says he plans to visit her grave for the last time today; it'll help him move on.

A noisy intersection outside the school has been transformed into a memorial garden for staff and students to remember and reflect.

Hundreds of flowers of all colours now accompany the "Marjory Stoneman Douglas High School" sign.

But not just flowers - there are painted pebbles and paving slabs with messages, a totem pole with all 17 victims' names, and 17 angels that light up at night.

Staff and students, many in maroon "#MSDStrong" T-shirts, have been coming all day. So have parents, friends and other loved ones.

On occasion, Amazing Grace is played out of a speaker that's been set up.

Victoria Gonzalez created the garden, named Project Grow Love, with her teacher Ronit Reoven. Victoria lost her boyfriend Joaquin in the shooting. Today she's wearing a brooch with a photo of him.

She remembers her final morning with him last year, on Valentine's Day: "We shared our gifts and we just felt unstoppable and he did always tell me that our love was bulletproof, believe it or not. I'll always remember that morning."

How else is the event being marked?

Elsewhere in the country, schools marked the anniversary with art projects or statements.

Boardman High School in Ohio held a "legacy lockdown" including an active-shooter drill, which organisers said was a way to help students feel safer and emergency officials to feel more appreciated.

The Buffalo Teachers Federation in New York encouraged people to wear bright orange, as hunters do for safety, and hold a moment of silence.

Media playback is unsupported on your device Media caption "When people think of Parkland I want them to think about people standing up for something"

In a statement, President Donald Trump said: "Today, as we hold in our hearts each of those lost a year ago in Parkland, let us declare together, as Americans, that we will not rest until our schools are secure and our communities are safe."

Former President Barack Obama - who told BBC News in 2015 that it was "distressing" that the US has not passed national gun safety reform - tweeted his support to the March for Our Lives students on Thursday.

What has changed in the past year?

According to the Giffords Law Center, an organisation advocating for more gun control, lawmakers in 26 states and Washington DC passed 67 new gun safety laws in 2018.

Four states raised the minimum age for firearms purchases, and seven states strengthened or expanded background checks for gun buyers.

More than half of all 50 states passed at least one gun control measure in 2018, according to the New York Times.

The federal government enacted Mr Trump's ban on bump-stocks, a device that enables many rifles to fire at the rate of a machine-gun.

Media playback is unsupported on your device Media caption Why Parkland school shooting is different - the evidence

Bump stocks were used to kill 59 people in Las Vegas in 2017 - and injure more than 400 - but were not used by the shooter in Florida.

Democrats have made gun control efforts a priority since winning a majority in the House of Representatives in November, and earlier this week took their first action to address gun violence.

On Wednesday the House Judiciary committee approved a bill that would require gun buyers to undergo background checks in virtually every single gun sale.

The bill now moves to the full chamber, and must be passed by both the House and Senate.

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