The US has “several” intelligence indications that Iran has put portions of its air defense system on “high alert” in recent days, following unexplained explosions at key facilities tied to the country’s military and nuclear programs, according to a US official who is closely tracking developments.

The change in alert status means Iranian surface-to-air missile batteries would be ready to fire at targets perceived to be a threat.

The official would not say how the US picked up on these indicators, but American satellites, spy planes, and ships routinely operate in nearby international airspace and waters where they continuously monitor Iranian activity.

Click here to read the full article.