[Ongoing] Comcast (NSDQ: CMCSA) CEO Brian Roberts started off the company’s earnings call by acknowledging the rampant reports that the company is on the verge of purchasing a stake in NBC Universal (NYSE: GE). Roberts said he could not comment on what he referred to as “rumors.” But he said that the company would only look at opportunities in its “core businesses” that could “accelerate growth” and provide scale. “We will continue to have a very disciplined approach as we evaluate these opportunities,” he said. More to come.