Marblehead parents filed a lawsuit protesting the suspension of extracurriculars during an ongoing teachers strike, as picket lines set up outside schools in three North Shore towns and tensions escalated Tuesday.

While the three strikes are separate, some of the sticking points have been the same — as they have in a recent wave of other teacher strikes across the state.

Massachusetts teacher strikes "Yesterday there was a lot of back and forth. It felt really good," Beverly preschool paraprofessional Judy Martin told WBZ-TV Tuesday. "We're really