Top 'tiger' caged by graft probe

Former security chief investigated for 'serious disciplinary violations'

On a day internationally dedicated to the preservation of tigers, China caught one of its biggest "tigers" - a term used by Chinese to refer to high-ranking corrupt officials.

Zhou Yongkang, former security chief, is being investigated for suspicion of "serious disciplinary violations", the Communist Party of China Central Committee announced on Tuesday, International Tiger Day.