The Brief Darby Borough Mayor Joar Dahn was injured in a hit-and-run crash on the night of July 28 in Philadelphia. Darby Borough Mayor Joar Dahn is recovering after being injured in a hit-and-run crash on the night of July 28 in Philadelphia, according to statements released by Dahn. The crash happened near La Salle University’s campus, near homes and a busy business corridor. Last night, Mayor Dahn was involved in an automobile accident. Editors Note: The mayor’s post says the crash happened on La Salle University’s campus, but the University clarifies that it was near campus.