OANDA fxTrade Joins Forex in Banning OTC Gold, Silver Trading on Margin

Oanda has just joined Forex in banning OTC trading of gold and silver on margin. Oanda advises they will allow traders to maintain positions, but only on a 1:1 leverage basis. 
Specifically banned is the XAU/USD, XAG/USD, XAU/JPY, and XAG/JPY.