Taipei's city government is facing a corruption scandal, a political blow to Mayor Chiang Wan-an as he moves fast to contain it.

• Lin Yu-yi, head of the Feitsui Reservoir Administration, has been removed from his post and is under investigation.
• The case started with a tip-off to the city's ethics office, which opened its own investigation and briefed the mayor on Monday.
• Chiang ordered a strict and quick inquiry, then fired Lin once told the case may involve criminal wrongdoing.
• The national Agency Against Corruption has now taken over the case from city investigators.

Outlook: The corruption agency's findings will decide whether charges follow, and how much political damage lands on Chiang's administration.