TORONTO -- More than 20 Toronto schools are being closed due to COVD-19 investigations as the city's public health unit defends their decision to keep facilities open to in-person learning. Toronto Public Health and various school boards confirmed the closures Monday night “Today, Toronto Public Health (TPH) has recommended the temporary dismissal of all school cohorts for the following schools as a result of ongoing COVID-19 investigations,” Toronto Public Health said in a statement to CP24. “Each COVID-19 case in a school requires a careful investigation to determine the potential risk to other individuals in that setting, and based on the findings of the investigation, decisions are then made on how best to protect the staff and students in the school, including dismissing some cohorts or all cohorts,” the statement read.