The eurozone's debt crisis is once again in danger of spiralling out of control after yields on Portuguese debt spiked to a post-EMU high and contagion hit Spain and Belgium. The European Central Bank (ECB) intervened heavily in the markets, buying Greek, Irish and Portuguese bonds to drive down yields again, but has yet to broaden its emergency purchases to a fresh set of countries. Germany's Bundesbank is vehemently opposed to policy "creep" that involves the ECB in fiscal rescues by the backdoor. The bank's refusal to be drawn further has left Belgium fending for itself as an escalating constitutional crisis pushes yields on its 10-year bonds to a post-euro record of 4.27pc. The country has not had a government since Flemish separatists emerged as the biggest party in elections seven months ago.