PROVIDENCE, R.I. (AP) — Brown University says it may have to reconsider its policies on public lectures after New York City Police Commissioner Ray Kelly was shouted down by students and community members as he tried to give a speech about his department's stop-and-frisk policy.

Kelly's speech Tuesday was canceled when protesters would not let him speak.

Marisa Quinn, a spokeswoman for the Ivy League school in Rhode Island, said Wednesday it's valuable to have such events open to the public, but they must be conducted as a free exchange of ideas.

Providence Public Safety Commissioner Steven Pare, who attended the event, said he was disappointed he didn't get to hear Kelly answer questions about stop-and-frisk.

A federal judge recently ruled the NYPD policy violated the civil rights of minorities; the city is appealing.