CNBC | Dow futures briefly fall 300 points; oil sinks below $28 CNBC U.S. stock index futures pointed to a sharply lower open, with Dow futures tumbling triple digits as European and Asian shares tumbled in the wake of renewed oil price weakness. European stocks fell sharply shortly after market open, with the pan ... Dow futures fall 300 points; oil sinks below $28 Dow futures fall more than 300 points as oil, Asia selloff rattle investors |