AT&T service disruption cripples 911, grounds flights after explosion
Residents report RV sounded alarm before bomb went off offering 'fair warning' to those in area
Congressman believes infrastructure was the target "that's possibly more dangerous"
Nashville is turning from relief to resolve, Mayor John Cooper said Friday evening after an early morning explosion downtown upended Christmas Day and caused destruction for several blocks.
No known suspects nor motive have been announced behind a bomb that detonated inside a parked RV on Nashville's historic Second Avenue near Lower Broadway.
Police have found what they believe are human remains but had not confirmed any fatalities.