A son of Singapore’s prime minister has been reprimanded for e-mailing a complaint about a fellow army officer to the country's defence minister and hundreds of other military personnel. The case involving Li Hongyi has served as a lightning rod for criticism on the internet of his family’s political power.

The defence ministry said on Friday it had issued the reprimand against Mr Li, 20, after his 2,000-word letter of complaint was posted on the internet and drew widespread attention.