U.S. officials have commented on recent incidents, claiming that Israel is isolating the United States from most of its actions in Iran "and leaving it in the dark" 

"We are seeing real escalation, Israel has deepened targeted assassinations and mysterious operations in the heart of Iran." 

At the same time, Iran has raised the alert level of its air defense systems.

Regarding Iran's nuclear escalation, Washington says: "The situation has become very tense recently"

Source: N12 News - Photo: Funeral in Iran - Reuters