Menagh air force base near Aleppo has been surrounded by the rebels since January. It is a classic siege. The rebels have thrown lots of mortars, ATGMs and rockets at it. Killing the tanks there one by one.
The government have been re-supplying by airdrop (the runway is not usable, being under constant fire) and have been doing repeated air strikes against the surrounding rebels, at least 6 this morning, for instance.
Now the rebels made the mother of all car bombs. They added lots of extra armour to a BMP armoured personnel carrier, put 6 tons of high explosives in it then drove it into the centre of the base and set it off.
BMP setting off on mission:
The explosion:
Then they sent in the infantry:
There are so many cameras in the conflict and they upload videos so quickly that it is possible to follow events in near real time.