Chicago police released a missing persons flyer and said no further information was available.

Inaki Bascaran Missing Pers... by ABC News

With no leads, Fradin turned to social media, creating a website and Instagram page to spread the news.

\"Iñaki has so many friends from so many areas in his life,\" she said, from his soccer league to high school to college to abroad, that \"we just knew that we would get a really big group of people to care.\"

On Monday, about 200 friends, family and strangers, armed with flashlights and neon vests, conducted a search, \"starting at Celeste and routing people different directions that Iñaki might have done,\" Fradin said.

\"It's amazing how quickly everyone has been able to mobilize,\" she said.

The family hired a private investigations firm to help.

\"You cannot have enough resources\" in a missing persons case, private detective Sara Serritella told ABC News.

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They followed Bascaran's digital footprint, including surveillance videos from that night, but \"the answers are not in the phones and the cameras,\" Serritella said.

It's shocking \"to think that you can just disappear and go missing in spite of technology and cameras,\" she said.

But Serritella said she's \"following hundreds of leads that have come in\" through social media and email.

She said they're using drones, man power, digital forensics and \"everything possible to try to get him home.\"

On Wednesday, the family held a vigil, where there was an \"outpouring of support,\" Fradin said, including hundreds who watched live on Instagram.

Fradin said this tough week has been filled with both sadness and hope.

\"There's been times where we've been sobbing together and times where we've been laughing together, telling our favorite stories and memories with him. ... And how excited we are to make fun of him for putting us through all of this once he comes home,\" she said.

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