  We prove that if $u$ is a suitable weak solution to the three dimensional
Navier-Stokes equations from the space
$L_{\infty}(0,T;\dot{B}_{\infty,\infty}^{-1})$, then all scaled energy
quantities of $u$ are bounded. As a consequence, it is shown that any axially
symmetric suitable weak solution $u$, belonging to
$L_{\infty}(0,T;\dot{B}_{\infty,\infty}^{-1})$, is smooth.
