1.   The Marcus Hook refinery simply came along with the deal.

2.   Now that refinery will come under regulatory scrutiny because Valero would pick up two other refineries in California by buying Ultramar.

3.   The refinery has recently come under criticism from World Bank officials who said its machinery was obsolete, expensive and uneconomic to run.

4.   Sunday was the first time the refinery has come under attack although the capital itself has been the target of several missile attacks and air raids.