While the motivation of the assailant remained unclear, Japanese officials have urged increased security around Japanese schools in China.

In a call with China’s vice-foreign minister Sun Weidong on Thursday, Japan’s ambassador Kenji Kanasugi “strongly urged” Beijing to share detailed information about the incident, which was the second targeted attack on Japanese schoolchildren in China in recent months.

A 10-year-old student at a Japanese school in China died Thursday after being stabbed on the way to school the day before, Japanese officials said.