Honolulu police are under investigation over how much force officers used during a Waikiki arrest, a bad look for the department while it waits on the facts.

• A 35-year-old man was arrested Friday night on Kalakaua Avenue in Waikiki for family abuse and resisting arrest.
• His family says he came out of it with broken ribs and a punctured lung.
• Investigators now have to work out whether police caused those injuries.
• Video of the arrest is circulating, but what happened before it started is still unknown.
• A law enforcement expert cautions against calling it police brutality before the facts are in.

Outlook: The internal investigation will decide whether the officers face discipline or are cleared.