KUALA LUMPUR, Feb. 9 -- What started as an investigation into unusual loan approvals has now unravelled into a full-blown corruption and money laundering scandal.

Dubbed Op Sky, the Malaysian Anti-Corruption Commission's (MACC) latest crackdown has led to multiple arrests, frozen bank accounts worth millions, and exposed the alleged involvement of local celebrities.

As the case continues to unfold, here's a primer on what we know so far:

What is Op Sky?

On January 14, the MACC revealed that it had arrested 12 people after dismantling a syndicate that enabled civil servants blacklisted by financial institutions to still obtain personal loans from local banks.

MACC Chief Commissioner Tan Sri Azam Baki said that initial investigations i...