  We address the compressible magnetohydrodynamics (MHD) equations in
$\mathbb{R}^3$ and establish a blow-up criterion for the local strong solutions
in terms of the density only. Namely, if the density is away from vacuum
($\rho= 0$) and the concentration of mass ($\rho=\infty$), then a local strong
solution can be continued globally in time. The results generalise and
strengthen the previous ones in the sense that there is no magnetic field
present in the criterion and the assumption on the pressure is significantly
relaxed. The proof is based on some new a priori estimates for
three-dimensional compressible MHD equations.
