Hamilton under investigation for pre-race practice start

Hamilton took the 96th pole position of his F1 career in qualifying at the Sochi Autodrom on Saturday, beating Red Bull's Max Verstappen and Mercedes teammate Valtteri Bottas.

But Hamilton was spotted completing a practice start at the very end of the pit exit slip road en route to the grid, passing the kink at Turn 1.

Drivers are only permitted to complete practice starts at pit exit for safety reasons due to concerns about the closing speed of cars coming through Turn 1 on the track.

Race director Michael Masi outlined on Thursday in his pre-race event notes where drivers are permitted to complete practice starts.

"Practice starts may only be carried out on the right-hand side after the pit exit lights and, for the avoidance of doubt, this includes any time the pit exit is open for the race," Masi wrote.

"Drivers must leave adequate room on their left for another driver to pass."

The stewards swiftly announced that the incident involving Hamilton was under investigation for complete a "practice start outside of the designated area".

It puts Hamilton at risk of a penalty ahead of the Russian Grand Prix where he was aiming to equal Michael Schumacher's record of 91 grand prix victories.

Hamilton also already has eight penalty points on his FIA super licence, and could be set to receive further points as a result of the incident.

Any driver who accrues 12 penalty points in a 12-month period is handed a one-race ban.