Spokeswoman Leslie Scott says the airline is looking into whether the male flight attendant violently took away the stroller from the female passenger just before she boarded a Friday flight from San Francisco to Dallas. He has been removed from duty in the meantime.

A video taken by a passenger and posted on Facebook shows the sobbing woman holding a small child and saying, “You can’t use violence with baby.”

Later, an unidentified male passenger confronts the flight attendant, telling him, “You do that to me and I’ll knock you flat.” The flight attendant responds with “Hit me. Bring it on.”

The incident comes less than two weeks after video of a man being violently dragged off a United Express flight sparked widespread outrage.