That's what we call a "break in" attempt. Call the police or ask for your neighbors ring camera footage.

8:30 AM. i was in the next room. nobody in sight. glass broken on outside, not inside. no glass or anything on the porch. i have RING and no sight of anyone.

Improperly installed.

Looks to be installed properly. Seems to have been a failed assassination attempt. Do you have any enemies?

Only the exterior glass was broken. Agrred. The concern/mystery is the fact that the window fell inside from the frame. If it was a spontaneous implosian, would it have the muzzle velocity to push a window in? unlikely.

Outside glass only broken.

Mystery is the window falling from frame. would a spontaneous implosion have the muzzle velocity to blow in the window???

No. There is no part of an "implosion" that would make the window fall from the frame. You window was broken by some sort of projectile or misuse. This is not an "implosion".

Perhaps it had been tilted in recently for cleaning and wasn’t latched back into the frame all the way and a gust of wind made it fall back in.

That is way more likely than an spontaneous implosion.

Seriously, claiming it was not installed properly is complete nonsense. This has absolutely nothing to do with your installer and everything to do with the owner not properly operating the window.

Window was secure. locked at top (see photo). clips at top. window was closed all the way as the alarm was set.

They don't just fall out.

We had this happen once with a 100-year-old casement window. The cause in that case was determined to be strong winds plus a non-air-tight window sash (with some dry rot in the sash that meant the screws didn't hold as well), so the pressure of the wind blowing through the crevices at the edges of the window essentially forced the window into the house. It was incredibly scary since it happened in the middle of the night and I was sure someone was breaking into our home--but no, there was the shattered window sash, ripped off its hinges. (We replaced both that window and its twin to try to prevent a similar fate from befalling the other window, and haven't had issues in the years since.)

Here, my first guess would be that the window wasn't seated properly in its frame (especially if it tilts out for cleaning). But if there were winds that day, that could be a possibility to look into as well.

Thank you! Had the builder check it out. They did not see anything wrong with the installation (big surprise). After viewing our RING video, there were bushes swaying from wind. It is possible it swirled on our porch corner and was enough to blow the window off. Unfortunately, the window appears to have been properly closed and secured.