BEIJING -- China's Ministry of Education has issued a guideline on kindergarten supervisors in a bid to tighten safety and ethical supervision over pre-schools.

Supervisors must be assigned to every kindergarten registered with the county, municipal and district-level governments, says the guideline.

Supervisors are supposed to instruct and oversee schools on issues such as safety, management and teachers' ethical standards.

Once an emergency or a major accident threatens kindergarten safety, supervisors must reach the scene at the earliest time, supervise the emergency response and report to higher authorities, the guideline says.

The guideline also orders kindergartens to fully comply with supervisors and earnestly address issues lodged by them.