Guardian: BP came under fresh attack last night amid accusations that it had ignored internal safety reports of a leak on the Deepwater Horizon rig and had not used industry best practice for avoiding oil spills. The news comes just as BP officials were hoping that their long nightmare was starting to be over as the new cap on the leaking oil well appeared to be holding firm and working well. There had been concerns that the cap might damage the stricken well and allow oil to burst out …