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We show that an extremal Gibbons-Maeda-Garfinkle-Horowitz-Strominger blackhole may act as a particle accelerator with arbitrarily high energy when twouncharged particles falling freely from rest to infinity on the near horizon.We show that the center of mass energy of collision independent of the extremefine tuning of the angular momentum of the colliding particles. We further showthat the center of mass energy of collisions of particles at the ISCO($r_{ISCO}$) or at the photon orbit ($r_{ph}$) or at the marginally boundcircular orbit ($r_{mb}$) i.e. at $r \equiv r_{ISCO}=r_{ph}=r_{mb}=2M$ could bearbitrarily large for the aforementioned spacetimes, which is different fromSchwarzschild and Reissner-Nordstr{\o}m spcetimes. For non-extremal GMGHSspacetimes the CM energy is finite and depends upon the asymptotic value of thedilation field ($\phi_{0}$).

String Black Holes as Particle Accelerators to Arbitrarily High Energy