Hatu said:Let the carpet bombing begin (or at least four missiles):
U.S. officials say Russian missiles heading for Syria landed in Iran.
Monitoring by U.S. military and intelligence assets has concluded that at least four missiles crashed as they flew over Iran.
The U.S. believes, based on intelligence reports of damage assessments, that some buildings were damaged and civilians may have been hurt.
http://www.cnn.com/2015/10/08/politics/russian-missiles-syria-landed-iran/index.html
Heard that failure rate isn't uncommon.