Words that have confusing meanings in a diplomatic notice Here is a sentence excerpted from a notice posted at the official website of the Consulate-General of China in Toronto on Nov 1, 2017 as follows "中国驻多伦多总领馆再次郑重提醒广大华侨华人和中国留学生注意防范电信诈骗。"

How do we differentiate 华侨 and 华人 and 中国留学生？Doesn't 华人 include 华侨 and 中国留学生？If 华人 means Canadians of Chinese blood, then is it the proper and legal business of the diplomatic office of China to handle matters in their connection?
华侨； Chinese people who live in other countries but are still citizens of China.

华人（广义）: people of Chinese blood 

华人（狭义）：Chinese people who become citizens of other countries 

(e.g.  美籍华人)