HERNDON, Pa. — Teachers in the Line Mountain School District have hit the picket line in central Pennsylvania.

The strike began Thursday in the district about 35 miles north of Harrisburg.

The teachers struck after the school board voted Wednesday night to reject an arbitrator’s report.

The district plans to continue teaching seniors during the strike, so their graduation date of June 17 will not have to be postponed.

The district believes the strike may last only six days, meaning classes for all students should resume May 20. That’s based on a state law requiring student to receive a certain number of classroom instruction days each year.