  This letter reports results from the partial wave analysis of the
$\pi^{-}\pi^{-}\pi^{+}\eta$ final state in $\pi^{-}p$ collisions at 18GeV/c.
Strong evidence is observed for production of two mesons with exotic quantum
numbers of spin, parity and charge conjugation, $J^{PC} = 1^{-+}$ in the decay
channel $f_{1}(1285)\pi^{-}$. The mass $M = 1709 \pm 24 \pm 41$ MeV/c^2 and
width $\Gamma = 403 \pm 80 \pm 115$ MeV/c^2 of the first state are consistent
with the parameters of the previously observed $\pi_{1}(1600)$. The second
resonance with mass $M = 2001 \pm 30 \pm 92$ MeV/c^2 and width $\Gamma = 333
\pm 52 \pm 49$ MeV/c^2 agrees very well with predictions from theoretical
models. In addition, the presence of $\pi_{2}(1900)$ is confirmed with mass $M
= 2003 \pm 88 \pm 148$ MeV/c^2 and width $\Gamma = 306 \pm 132 \pm 121$ MeV/c^2
and a new state, $a_{1}(2096)$, is observed with mass $M = 2096 \pm 17 \pm 121$
MeV/c^2 and width $\Gamma = 451 \pm 41 \pm 81$ MeV/c^2. The decay properties of
these last two states are consistent with flux tube model predictions for
hybrid mesons with non-exotic quantum numbers.
