Denver school leaders and teachers are back at the bargaining table as they try to end a strike over pay that has entered its second day.

Negotiations got under way Tuesday with the help of a federal mediator for the first time since talks broke down over the weekend.

The negotiating room at Denver’s main library was packed with teachers wearing red. They broke out into chants from the picket lines as school district administrators entered to start the contract discussions with union leaders.

Teachers planned a march and rally downtown later in the day near the site of the talks.

The two sides in Denver disagree on pay increases and bonuses for teachers in high-poverty schools and other schools the district prioritizes.

Teachers want lower bonuses to free up money for better overall salaries.

The strike started Monday and all schools were open Tuesday. They are staffed by administrators, substitutes and teachers not participating in the strike.

The school district says preliminary reports show 58 percent of teachers stayed out of district-run schools on Tuesday, slightly more than on the first day of the strike Monday.

There are 71,000 students in district-run schools.

Another 21,000 are enrolled in charter schools unaffected by the strike.