I stand corrected! I read the article in the magazine described above. It is clear that the captures were form this video, and not the described events. My memory betrays me, as I just found the clip I was thinking of on my PC. The vehicle designation is correct, Paco.
HavHav, the Taliban, and other such groups often videotape the attacks for variuos reasons. They often carry some sort of camera with them. In the case of the Chechens, they tape it to show to whoever is paying them to carry out the attack. Solid proof of success, I suppose.
Rebels often use unexploded artillery shells as makeshift "mines". They are detonated various ways, one of which is simply wiring an electric device and waitng behind a rock, or other cover to hand detonate the device. The area where this fighting is taking place is a real nice area, and is littered with the debris of battle. There are many unexploded mines, and shells, and bombs, etc that can be used to create such devices.