The US has several intelligence indications that Iran has put some of its air defense systems on high alert in recent days, CNN reported early Friday morning, citing a "US official closely tracking developments." While the official refused to specify how the US got hold of the intelligence, he or she confirmed that the Islamic Republic has changed the alert status on its surface-to-air missile batteries, in a move indicating it would fire at airborne targets perceived as a potential threat. In early 2020, Iran confirmed its air defense batteries mistakenly shot down a Ukrainian plane killing all 176 people...