Kelly Oubre Jr.'s recent car accident has raised some questions within the Philadelphia Police Department ... and now, an internal investigation has been launched.
TMZ Sports has learned -- the PPD's Internal Affairs Division is looking into the handling of Monday night's crash involving Oubre and another driver ... specifically officers' response and actions while at the scene.
As we previously reported, cops told us Oubre's Lamborghini ran a red light and hit a 2023 Hyundai Elantra .