Referee DeRosa tosses ball at fan

ORLANDO, Fla. -- The NBA is investigating an incident between referee Joe DeRosa and a fan at halftime of Tuesday's Game 2 of the Eastern Conference finals between Orlando and Boston.

DeRosa was walking to the scorer's table to get the warm-up jackets for his crew, a common practice before the trio of referees leave the floor at intermission. A fan behind the table approached DeRosa, gesturing with his arms and appearing to be shouting at the veteran official.

DeRosa flipped the game ball to the fan, who tossed it back. DeRosa then motioned for the man to be ejected by security.

The NBA had no immediate comment, other than saying it was reviewing the matter.