Using social media, a woman has found the owner of a wedding photo discovered at Ground Zero several weeks after 9/11, the New York Daily News reports.

On Friday, Elizabeth Stringer Keefe, an assistant professor at Lesley University, learned that the photo belonged to Fred Mahe, a man who once had an office on the 77th floor of the second World Trade Center tower, according to ABC News.

“Every year on #911 I post this photo hoping 2 return 2 owner. Found at #groundzero #WTC in 2001. Pls RT,” Keefe tweeted on Thursday, wondering if the 13th anniversary of 9/11, like the dozen before it, would end without her being able to return the photo to its rightful owner.

According to The Boston Globe, this anniversary was different. Twenty-four hours later, more than 40,000 people had retweeted the photo of a wedding party. Mahe, who is seen in the photo, was made aware of the effort to find the photo’s rightful owner via a co-worker.

“I had not seen that photo for quite a while,” Mahe told the Daily News. “That was one of my great photos — it had all my friends in it, and it was an awesome wedding.”

Mahe identified the couple in the photo as Christine and Christian Loredo.

According to ABC News, Mahe was on his way into work when the attacks began, 13 years ago.