[A good 15 minutes after Tony calls for help
, JARVIS in Stark Tower issues a general distress alarm and the building goes into lockdown.
Fire breaks out on the lower levels, and anyone already in the building is locked where they are as a several highly-trained teams, in successive waves, attempt to get up to Tony Stark's lab, storming each level one at a time.
JARVIS issues informational calls to NYC law enforcement and fire dispatch. Local heroes are also connected with those on site. Known heroes who volunteer help on the journals are issued a phone number of instructions that guide them to earpiece comms, if they don't already have them.
JARVIS, broadcast NYC-area comms:]
Be advised that an unknown hostile force had opened fire in Stark Tower.