Japan's ambassador to Beijing has asked for more security for Japanese nationals in China after a 10-year-old Japanese boy was killed this week in a knife attack that was the second to target school students.

Japan has formally requested that China provide a comprehensive explanation regarding the circumstances of the attack in which a 10-year-old boy enrolled at a Japanese school in the Chinese city of Shenzhen was stabbed to death by a 44-year-old assailant.

Japanese companies in China are offering to send their staff and families back to Japan after a fatal stabbing of a 10-year-old Japanese boy in Shenzhen. This incident prompted Japanese authorities to seek increased security measures from China,