CHICAGO (CBS) — A man was attacked after meeting a person on a dating app.

It happened earlier this week after the victim used the dating app Grinder.

The 22-year-old man got into an altercation with another the man in his Uptown apartment.

He ended up running naked from the apartment after the other man pulled out a knife and tried to rob him.

“I recall hearing the yelling,” says witness Will Lazicki. “I might have heard the gate slam after I heard the yelling. I heard ‘help, help, help, help!'”

So far there have been no arrests in the alleged attack.