The Ministry of Defence of Belgium confirmed that one F-16 was burned to the ground:
On October 11, 2018, at approximately 2:10 pm, a fire broke out during maintenance work on an F-16 on the Florennes Base. The plane burned. A second aircraft suffered collateral damage.
The column of smoke after the explosion, Source: sudinfo.be
Also according to vrt.be website:
Two technicians were slightly injured in the accident.