Smoke Alarm Activation At Our House (6:30 AM, 5-11-2024)

I was in bed, awake, and I hear the beeping of the fire alarm from the panel, and I run down, the phone rings from the alarm company, so I check it out, then I go to the panel and find out that the alarm came from my parent's bedroom.

[@MrFfwrch]

What caused the alarm?