MEXICO CITY, Oct 31 (Reuters) - At least one person was killed and over a dozen were injured when a pipeline of state oil firm Petroleos Mexicanos (Pemex) exploded in the central Mexican state of Puebla after it was breached by suspected fuel thieves, authorities said on Sunday. Alerted to a gas leak, the Puebla state government said it had averted a higher death toll by evacuating residents from the site in the San Pablo Xochimehuacan municipality before three explosions occurred, wrecking between 30 and 50 homes.... some 1,400 rescue workers had been mobilized....