  A search for dark matter in the form of strongly interacting massive
particles (SIMPs) using the CMS detector at the LHC is presented. The SIMPs
would be produced in pairs that manifest themselves as pairs of jets without
tracks. The energy fraction of jets carried by charged particles is used as a
key discriminator to suppress efficiently the large multijet background, and
the remaining background is estimated directly from data. The search is
performed using proton-proton collision data corresponding to an integrated
luminosity of 16.1 fb$^{-1}$, collected with the CMS detector in 2016. No
significant excess of events is observed above the expected background. For the
simplified dark matter model under consideration, SIMPs with masses up to 100
GeV are excluded and further sensitivity is explored towards higher masses.
