Teachers shut down 2 suburban Denver high schools

Teachers have shut down two high schools in suburban Denver amid a dispute over proposed changes to a history course and their pay.

The Jefferson County School District says classes had to be canceled at Golden and Jefferson high schools on Monday because so many teachers called in sick.

The action follows waves of student walkouts last week to protest a proposed review of the Advanced Placement history course to make sure it promotes patriotism. A sickout by teachers closed two other high schools on Sept. 19.