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.

A 10-year-old Japanese student has died one day after he was stabbed near his school in southern China. The boy, who was enrolled at the Shenzhen Japanese School, succumbed to his injuries early on Thursday, Japanese officials said. His assailant, a 44-year-old man surnamed Zhong, was arrested on the spot, local police said.

Officials in Tokyo said Thursday that a 10-year-old Japanese student attending a Japanese school in southern China who was attacked the day before has died, asking Beijing to provide details of the stabbing and take preventive measures.

Icom is looking into reports that its two-way radios were denotated in attacks across Lebanon Wednesday, which killed at least 20 people and injured more than 450.

The walkie-talkies that exploded in Lebanon Wednesday have not been made for over a decade, according to Japan's Icom Inc. The company's brand name was on the devices.