More and more Bulgarian media outlets are reporting eyewitnesses saying that a possible reason why the BESA Tours burnt down so quickly is that it was carrying extra fuel. The bus was returning from a long weekend tour to Istanbul, and Turkey currently has far lower gas prices than Macedonia or Bulgaria.
The road was covered with oil, said local road safety engineer Vasko Pirgov.
The investigation is still on-going, but it is reported that the bus hit a highway fence, and scraped along it for a while. Journalist Patricija Kirova speculates that this friction could have set the extra fuel on fire.
Macedonian Government ministers who met this evening were asked whether this is a possible cause of the disaster in which 45 people lost their lives. Interior Minister Oliver Spasovski said that there are police experts sent to Bulgaria and they, along with the Bulgarian authorities, will quickly determine the cause of the fire.