The US has categorically denied that any of its aircraft were involved. It has admitted that its aircraft were in the area, but says that they carried out an air strike 55 km away.

The Russians say that is true. However, they also say that it is not the whole truth.

The Russians say that in addition to the US aircraft, two pairs of aircraft – in other words four aircraft in total – from two other countries that are also members of the US led coalition were also flying at the time of the air strike over Deir az-Zor.

The Russians have not actually said it was these aircraft that carried out the air strike. However, they have pointed out that the US has failed to admit to the presence of these aircraft. They are asking why?

via Did Members of the US-Led Coalition Carry Out an Air Strike to Help ISIS? Russia Implies They Did.