At the end of the Ariana Grande concert in Manchester on Monday night, large pink balloons were released from the rafters. The lights came on, and people were starting to pour out of the arena when an explosion killed 22 people.

In videos taken from inside the venue, the fans — many of them young girls — can be seen clutching those pink balloons as they start to realize what had happened. The crowd begins to flee, and the balloons are left behind.

Now, pink balloons are being used as a symbol of solidarity with Manchester. At a vigil in Germany on Tuesday, balloons were released to honor the victims of the deadly attack. Some restaurants in the U.K. have tied pink balloons outside to show their support.

people are releasing pink balloons to remember the victims this is so heartbreakingly beautiful pic.twitter.com/IzJUey9X8C — kimana ⚯͛ (@wildfirenjh) May 23, 2017

Pink balloons - a symbol of the joy @ArianaGrande stands for, are being spread to mourn those lost in Manchester. Honestly beautiful 🎈💕 pic.twitter.com/rT9tBiHI6z — axl (@desirablemila) May 23, 2017

💖💖💖💖💖 #prayformanchester #pinkballoons A post shared by The Cafe (@thecafeoldham) on May 24, 2017 at 2:23am PDT

A search of the #PrayForManchester hashtag on Instagram and Twitter produces countless drawings, animations, and photos of balloons as people remember the lives lost.

In Gedanken bei den Opfern der #ManchesterAttacks und ihren Hinterbliebenen. pic.twitter.com/4LmQcXbJkq — BILD (@BILD) May 23, 2017

New trending GIF on GIPHY love, ariana grande, black, blue, pink, red, white, peace, uk, jack, balloons, support, manchester, union, britai… pic.twitter.com/9ZBAuAb0SD — Alex Fort (@AlexFort15) May 24, 2017

A post shared by Emma Wheeler Voice Overs (@emmawheelerbritvoiceovergirl) on May 24, 2017 at 4:01am PDT

Love and prayers to everyone affected by yesterday's horrific attacks. So many beautiful lives so tragically and wickedly taken. We stand in solidarity with everyone in Manchester and our thoughts are with you all. Xxxxxxx A post shared by The Loop (@theloop_youngfamilies) on May 23, 2017 at 11:11am PDT

For all the kids and parents we lost today. Maybe some talented creative could make something beautiful for them out of pink balloons #Manchester #ilovemcr #ilovemanchester #pinkballoons #symbolofhope 📷@bubblegumballoons A post shared by Léonie • Florence Gray (@flobouquets) on May 23, 2017 at 7:26am PDT

Dozens of posts on Instagram and Twitter showed that many residents in and around Manchester released balloons from their homes on Wednesday evening in a show of unity, after a caller on a popular morning show in the area asked listeners to join him in the touching tribute.

#Manchester #pinkballoons #love #rip #my baby's xxxx A post shared by Kirsty (@kirstyrobinson993) on May 24, 2017 at 11:22am PDT

Pinkballoons to send off at 6 o clock with the rest of Manchester #unitedwestand #pinkballoon #manchester A post shared by Felicity Simplicity (@felicitysimplicity) on May 24, 2017 at 8:14am PDT

Think it's remarkable, everyone coming together to let pink balloons out into the sky at 6pm. Beautiful tribute. #Manchester — Harry Williams (@Harry_Williams) May 24, 2017

In the immediate aftermath of other recent terror attacks, certain tribute images have emerged on social media. After the Paris and Brussels attacks, their flags were used for countless profile photos and drawings online as the world mourned.

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Now the Manchester attack, which targeted a venue filled with young girls, has inspired the balloons as a way to remember the victims as the community starts to heal.