The number of Saudi supertankers carrying oil and sitting offshore Egypt increased again on Friday, according to vessel tracking data monitored by Bloomberg, after signs emerged earlier this week that the previous large cluster had started to clear. An unusual cluster of mostly Saudi supertankers loaded with oil has been idling off Egypt’s Red Sea coast since early June. Signs emerged at the end of June that the cluster may have started to clear as two of the 11 tankers were no longer anchored near the Ain Sukhna…