Seattle Public Schools plans to turn away students who have not met vaccination requirements today.

The district said Tuesday that nearly 1,000 students were still missing either proof of vaccinations or exemption forms.

State law has long required schools to exclude students who are out of compliance with vaccination requirements. But many districts have not been following the law for years.

In Seattle, district officials say last year’s measles outbreaks around the state served as a wake-up call.

They’ve asked parents to keep students home today if they don’t have the required paperwork.

Those who come to school anyway will be sequestered until their parents pick them up.