  GW Ori is a hierarchical triple star system with a misaligned circumtriple
protoplanetary disc. Recent ALMA observations have identified three dust rings
with a prominent gap at $100\, \rm au$ and misalignments between each of the
rings. A break in the gas disc may be driven either by the torque from the
triple star system or a planet that is massive enough to carve a gap in the
disc. Once the disc is broken, the rings nodally precess on different
timescales and become misaligned. We investigate the origins of the dust rings
by means of $N$-body integrations and 3-dimensional hydrodynamic simulations.
We find that for observationally-motivated parameters of protoplanetary discs,
the disc does not break due to the torque from the star system. We suggest that
the presence of a massive planet (or planets) in the disc separates the inner
and outer disc. We conclude that the disc breaking in GW Ori is likely caused
by undetected planets -- the first planet(s) in a circumtriple orbit.
