The Globe and Mail reports in its Tuesday edition that Horizons ETFs Management is warning investors not to buy units of two of its oil-focused exchange-traded funds because the ETFs face possible implosion amid collapsing energy prices. The Globe's Mark Rendell writes that the company's two short-term oil funds, Crude Oil 2x Daily Bull (HOU) and Crude Oil -2x Daily Bear (HOD), may be forced to liquidate their assets if prices go much lower, Horizons said in a statement on Monday. The market value of the oil contracts underlying the funds are likely worth less than the value of the funds themselves. Prices have become disjointed after the funds stopped issuing new units last week. "It is imperative to note that units of HOU and HOD have and are expected to continue to trade at a substantial premium to their net asset value while subscriptions of new shares are suspended," Horizons said. "The manager continues to strongly discourage investors from purchasing shares of HOU and HOD at this time." West Texas Intermediate plunged 25 per cent to settle at $12.78 (U.S.) Monday, and Horizons warned that if WTI falls below $10 (U.S.), its funds will probably be forced to cash out of the oil market altogether.