Officer Gannon was serving a warrant with his K9 partner when things took a tragic turn.
No further information is available at this time.
ABC6 News will update you as soon as new information becomes available.
With a heavy heart ??, our condolences go out tonight to our brothers & sisters of the @yarmouthpolice & to Officer Sean Gannon's family & friends. We are also praying tonight for the recovery of Officer Gannon's K9 partner, who was also injured in today's tragic incident.#LODDpic.twitter.com/9ITeLFi3bq