More Ontario elementary teachers are starting strike action even as another school board has reached a tentative deal with high school teachers.

The Ottawa-Carleton District School Board was the latest to hammer out a tentative agreement early Thursday morning making it the eighth board to have struck a deal.

Six of those deals at York Region, Upper Grand School District, Thames Valley, Avon Maitland, District of Niagara, and Hamilton-Wentworth District school boards have been approved by the government so far.

The Durham school board is still waiting for the green light.

Teachers in about 20 other school boards are still in a legal strike position.

The OSSTF said details of the deals will remain confidential until the agreements are ratified.