• Muslim countries have been silent over China's crackdown on its Uighurs, a Muslim-majority ethnic minority in the country's west.
• Experts and activists say it is because countries fear economic retribution from China.
• Many also say it's because many Arab states also have poor human rights records, and don't want to draw attention to themselves.
• Turkey has tried standing up to China in the past — and Beijing has not forgotten it.

Money, money, money

China's Uighur treatment may not offend Arab states

What happened when Turkey tried to stand up to China

What Uighurs are saying