WEST CHICAGO, Ill. — Classes are back on for about 4,000 students in West Chicago after a tentative agreement ended a teachers strike in the Chicago suburb.

Officials with West Chicago Elementary District 33 started calling parents overnight to let them know that classes would resume Thursday after a three-day strike.

About 280 teachers began the walkout Monday after more than 17 months of negotiations failed to reach an agreement. The district includes six elementary schools, a preschool and a middle school.