The episode appears to reflect an undercurrent of public discontent with the People's Action party (PAP) government, which celebrates its 50th anniversary in power this year, as Singapore confronts its worst postwar recession, with the economy expected to contract by up to 5 per cent.

The PAP government has long been one of Asia's most secure. Singapore's dominant one-party system has set an example for countries such as China, Russia and the Gulf states. Their leaders “are picking up points here and there” about how Singapore can “keep its ruling party in place and run a tight ship, honest and effective”, says Lee Kuan Yew, the city state's founding father.

But the economic crisis is putting Singapore's political system to its severest test since independence in 1965. “Officials appear scared about the public reaction. I've never seen them so concerned before,” said a Singapore-based regional political analyst.