While radio communications were modified to address problems discovered after the 1993 World Trade Center bombing , investigations into the radio communications during the September 11th attacks discovered that communication systems and protocols that distinguished each department was hampered by the lack of interoperability , damaged or failed network infrastructure during the attack , and overwhelmed by simultaneous communication between superiors and subordinates
1993 World Trade Center bombing
1993 World Trade Center bombing
Communication during the September 11 attacks