CLEAN : Suspect of California school shooting had posted have fun at school on Instagram the day before

The video discusses a school shooting incident in Santa Clarita, detailing the involvement of local authorities and the status of the victims. It highlights the suspect's social media activity, which is under investigation, and confirms no established motive or group involvement. The investigation is ongoing, with security measures being heightened due to the suspect's custody status.

What is the current status of the investigation as mentioned in the text?

What security measures are being considered following the incident?