Crime. If the surveillance video at the scene of a car accident is deliberately tampered with or deleted, it will be regarded as a criminal act and infringe on the safety and integrity of evidence. The monitoring video of the accident scene is an important factor to investigate and judge the responsibility of the accident, and it is the basis and evidence. Someone deliberately tampered with or deleted the surveillance video, which will hinder the investigation and judicial justice. This behavior constitutes a criminal act of destroying evidence or obstructing judicial justice, and will be investigated according to law.