A heartwarming photograph has spurred a worldwide hunt for the people featured in it.
Twitter user Brooke Windsor posted the photo of a man and a little girl outside Notre Dame. It shows the man spinning the child as they both smile gleefully.
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"I took this photo as we were leaving Notre Dame about an hour before it caught on fire," said Windsor on Twitter.
"I almost went up to the dad and asked if he wanted it. Now I wish I had. Twitter, if you have any magic, help him find this."
Twitter quickly exploded with users desperate to locate the mystery pair.
"Oh my heart! Freaking adorable!" wrote one woman.
"I definitely wish you had asked if he wanted it. Maybe hopefully he'll see the post on social media and thank you for such a lovely photo."
"Twitter PLEASE do the thing with this one. This is such a good picture," wrote another.
Numerous people re-tweeted the photo with French translations, as well as sharing the post with French media networks.
So far, the post has received 127,000 likes and 63,000 shares.