KANPUR/PRAYAGRAJ, Aug. 11 -- The Uttar Pradesh Police have launched a probe into a fleet of private vehicles that allegedly followed the prison convoy carrying Umar Ahmed from Lucknow to Prayagraj under police custody to attend the funeral of his younger brother, Abaan Ahmed, son of slain gangster-politician Atiq Ahmed. Four FIRs have been registered in Prayagraj, Pratapgarh and Fatehpur over alleged toll plaza violations, threats to staff and attempts to drive vehicles into employees. Police are examining CCTV footage and vehicle registration details to identify those who travelled in the vehicles and establish who coordinated their movement. According to Prayagraj police sources, the FIR lodged at Nawabganj police station mentions 10 vehicles registered in Prayagraj, nine in Lucknow, and one each in Azamgarh, Bareilly, Gorakhpur, Jhansi and Delhi, besides several unidentified vehicles. Police have identified some vehicle owners through registration numbers and started questioning them. Investigators are seeking to establish who was driving the vehicles and who the passengers were at the time of the incidents. They are also examining whether the vehicles accompanied Umar's convoy from Lucknow or joined it at different points on the route to Prayagraj. The probe is focused on determining the relationship between the occupants of the private vehicles and why they followed the prison convoy. Vehicle owners are being questioned about who informed them about the trip and why they joined the convoy, according to police officials. Investigators are also trying to establish who coordinated or directed the movement of the large number of private vehicles from Lucknow to Prayagraj. In Fatehpur, two FIRs were registered against the drivers and occupants of 21 private vehicles following the police convoy, on complaints from staff at Barouri and Katoghan toll plazas....