Named preliminary cause of the fall of "Antares"

In the official press release of the Orbital company, the preliminary reason for the fall of the Antares launch vehicle on October 28 was announced - the failure of one of the turbopumps:



The engine NK-33 / AJ-26. Red highlighted turbopump unit .

The press release also states that the AJ-26 engines will most likely not be used on the Antares anymore. Despite plans to change the engine (which will require time to redesign the rocket), Orbital promises to deliver the entire cargo under the contract until the end of 2016.
The news is not very good, but it’s too early to draw conclusions before the exact reason is announced. For example, the culprit may end up being an extraneous particle that entered the turbopump inlet with an oxidizer, “struck” along the wall of the THA and led to an explosion.
The Orbital reaction can be understood - in the spring of this year there was already an engine explosion at the test bench, and, apparently, the company is losing confidence in it.
It should also be noted that the NK-33 engine is used on the Soyuz-2.1v domestic carrier rocket, the first flight of which took place in December 2013 .