If true this is good news. I think the international pressure on Obama to support a UN investigation has been intense. Had Netanyahu instigated a serious investigation by himself on the 1. of June he might have gotten away with no International investigation. But since Netanyahu seems to be doing all he can to avoid any serious investigation, the pressure has increased on Obama. So Obama is stuck with a choice: Protect Netanyahu, and weaken the US international standing, or dump Netanyahu and get hell in the US media.
Israeli PM to Palestinian President Abbas: We must fight terror together (Haaretz)
from the article: U.S. denies pushing for Gaza flotilla probe at UN