Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
The circular ordered stronger security patrols in and around school campuses at the beginning and the end of school days, and in schools situated in risk-prone communities.
In at-risk schools, police posts would be set up.
Schools were urged to tighten identity checks at entrances, hire security guards, and install security alarms and closed circuit television cameras on campus.
The ministry asked police to closely monitor people who were inclined to threaten public security and to increase monitoring of dangerous items and materials, including knives.
The circular followed a string of violent attacks against school children in the past week.
On Friday, five kindergarten class children and a teacher were injured when a man attacked them with a hammer before killing himself at a school in Weifang City, east China's Shandong Province.
On Thursday, 29 children and three adults were injured by a man armed with knife at the Zhongxin Kindergarten in Taixing City, in eastern Jiangsu Province.
And 16 children and a teacher at a primary school in Guangdong Province were attacked Wednesday.