Politicians and media fraternity express regret and extend condolences; PM and Punjab CM announce financial assistance for family.
Proscribed group says the prime minister and the government will be responsible for any more blood spilt.
The accident apparently took place because the vehicles were over-speeding in foggy conditions: officials.
FIR says six men raped the victim; medical report is awaited.
PR forms committee to investigate incident; PM Imran says Railways' "operational safety SOPs will be reviewed immediately".
The hours-long protest was against the arrest of suspects in an alleged forced conversion case.
SHO Rang Mahal Zahid Mehmood was travelling to Lahore from Murdike, when gunmen opened fire on his car on GT Road.