  Using the data sample of 980 fb$^{-1}$ collected with the Belle detector
operating at the KEKB asymmetric-energy $e^+e^-$ collider, we present the
results of an investigation of the $\Lambda\pi^+$ and $\Lambda\pi^-$ invariant
mass distributions looking for substructure in the decay
$\Lambda_c^+\rightarrow\Lambda\pi^+\pi^+\pi^-$. We find a significant signal in
each mass dis\ tribution. When interpreted as resonances, we find for the
$\Lambda\pi^+$ ($\Lambda\pi^-$) combination a mass of $1434.3 \pm 0.6
(\mathrm{stat}) \pm 0.9(\mathrm{syst})$ MeV/$c^2$ [$1438.5 \pm 0.9
(\mathrm{stat}) \pm 2.5(\mathrm{syst})$ MeV/$c^2$], an intrinsic width of $11.5
\pm 2.8 (\mathrm{stat}) \pm 5.3(\mathrm{syst})$ MeV/$c^2$ [$33.0 \pm 7.5
(\mathrm{stat}) \pm 23.6(\mathrm{syst})$ MeV/$c^2$] with a significance of
7.5$\sigma$ (6.2$\sigma$). As these two signals are very close to the
$\bar{K}N$ threshold, we also investigate the possibility of a $\bar{K}N$ cusp,
and find that \ we cannot discriminate between these two interpretations due to
the limited size of the data sample.
