More than 2,000 people were watching the fireworks show when a chain-reaction blast of three six-inch aerial shells blew apart launch tubes, knocking over another tube that discharged into the crowd.
Rappa said Bay Fireworks has been doing Ticonderoga's fireworks show for more than two decades.
The incident in Ticonderoga was the second for Bay Fireworks that weekend. The other occurred off Wantagh's Jones Beach, when a box of firework shells apparently fell off a barge being used as a staging area for a Bay Fireworks show.
Ninety of the shells washed ashore, causing an evacuation of the popular Long Island beach while they were cleaned up.