Of course everyone is wondering if Iran accidentally shot down Ukraine International Airlines Flight 752, but it's too early to say anything definitive. However, internet speculation is running rampant. Check out this snap from 0:24 in this video of the wreckage.
The speculation is that the dark spots you can see there on the fuselage are holes that were caused by fragmentation from an anti-air missile. Time will tell.
Update:
Here's a higher-resolution image of the first fuselage section shown above. It looks like the "holes" may actually be rocks.