“The Obama administration has declined to directly link the Azerbaijan plot to the Iranian government, avoiding what could be an explosive accusation at a time when the two governments are engaged in negotiations on limiting Iran’s nuclear program. U.S. officials say they are less convinced that top Iranian and Hezbollah leaders worked together to coordinate the attempted hits, noting that both groups have a long history of committing such acts on their own, and for their own purposes.”
Source: U.S. officials among the targets of Iran-linked assassination plots – The Washington Post