What's behind Malaysia's '1MDB' scandal?

Embattled Malaysian Prime Minister Najib Razak (L) gestures as he arrives along with Deputy Prime Minister Muhyiddin Yassin (R) to take part in an event for new government interns at the Prime Minister's office in Putrajaya in this photo taken July 28, 2015.

Story highlights

  • Malaysian PM accused of financial impropriety
  • Demonstrators demand PM Najib's ouster
  • Swiss authorities freeze accounts associated with 1MDB fund

Kuala Lumpur (CNN)Malaysia's Prime Minister, Najib Razak, is being buffeted by accusations of financial impropriety and noisy, angry protests calling for his ouster. The claims go back to July and relate to transfers made as far back as 2013.

So what is behind the political turmoil currently engulfing Kuala Lumpur?

What's behind the scandal?