Mayor Martin J. Walsh said he suspects “there’s more to this story” when asked yesterday whether a Boston police gang unit officer should be disciplined for verbally sparring with a civilian rolling video on him and calling him a “pig.”

“I think there’s more to this story than you see in the video. And quite honestly, the young man that he’s talking to responded in a negative way, as well,” Walsh said in response to the story in yesterday’s Herald.

Officer Zachary Crossen, 29, was recorded on the cellphone of a 25-year-old Roxbury resident asking the man for his name, whether he works, where he was going and calling him a “contributor” — a label the man told the Herald he took as an insult to his employment status.

“Your parents proud of you for flipping off the police?” Crossen asked the man, who the Herald did not identify. “Have a great day, contributor.”

Walsh said he’s leaving any disciplinary decisions to police after an internal investigation.

Boston police spokeswoman Rachel McGuire said yesterday Crossen remains on active duty.

“The department has seen the video and we’re looking to see if any rules were violated,” she said.

The man who shot the video told the Herald yesterday, “I’m glad they are looking into it, but once again the mayor admits that he doesn’t know what happened before the video. In terms of anything being done inappropriately, the fact that I was stopped and questioned without cause and then harassed and insulted is bad enough. Also I asked multiple times why I was stopped and got no answer.” The Herald is withholding the man’s name.

Crossen and the Boston Police Patrolmen’s Association could not be reached for comment yesterday. The two-minute-plus footage shows Crossen identifying himself upon request and flashing the badge on his hip, telling the man, “You can film it.” Crossen even playfully ducked down and said to the lens, “What’s up? What’s happening?”

But as the man refused to identify himself, the exchange grew tense. Crossen’s partner told the man, “You’re free to go, buddy.” The man thanked him before turning back to Crossen and mumbling, “You stupid (expletive). You’re stopping the wrong (expletive) person.” He is heard calling Crossen a “pig.”

Crossen repeatedly tells the man, “Go away.”

Crossen has been on the force since 2013. He has been active in the community, working with the Center for Teen Empowerment and organizing a gift drive for homeless veterans, according to news reports and BPDnews.com.