NASA has shot down a new Russian theory on the failure of its Phobos-Grunt martian moon probe: that the craft was damaged by asteroid-tracking radar signals from a U.S. installation in the Marshall Islands, The Washington Post reports.

Russiaโ€™s Kommersant newspaper quoted an unidentified Russian space official as saying, โ€œThere is a possibility that the station accidentally entered the area covered by the radar, which resulted in a failure of its electronics caused by a megawatt impulse. After that, it could no longer give a command to switch on the Phobos propelling system.โ€

But NASA spokesman Bob Jacobs said the agencyโ€™s scientists were not using the Marshall Islands radar to track an asteroid on Nov. 9, the day of the Phobos-Grunt launch.