According to military sources, the jihadist T-90 was engaged by a Syrian Army T-72 near Ma’an. In the ensuing tank battle, the Syrian Army T-72 landed a armor-piercing sabot round to the left side of the T-90, effecting a penetration and causing the tank’s ammunition to cook off.
Source: (Illingworth, Andrew,
https://mobile.almasdarnews.com/arti...72-north-hama/)
Additional comments here from UK's Channel 4:
http://boards.4chan.org/k/thread/35224465/t90-rekt.