Teachers see growing peril from violent parents. Some districts giving instructors training in conflict resolution

　　Jeffrey Doyle Robertson, right, and his attorney, William A. Reece, listen to charges against Robertson arising from Thursday’s shooting of Canton, Texas, high school coach Gary Kinne.[Photo]

　　The shooting last week of a Texas high school football coach — allegedly by a player’s father — was just the latest and most extreme example of the threats and assaults that teachers around the country say they are increasingly being subjected to by parents.

　　In Philadelphia in September, a mother slapped a teacher three times in the face after he told her she needed to get a late slip for her daughter, state officials say. In Dallas, a teacher got into a hair-pulling fight with a mother April 1 after scolding the woman’s daughter for loitering outside a locker. The mother is herself a teacher at a Dallas high school.