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Comparing the signals measured by the surface and underground scintillatordetectors of the Yakutsk Extensive Air Shower Array, we place upper limits onthe integral flux and the fraction of primary cosmic-ray photons with energiesE > 10^18 eV, E > 2*10^18 eV and E > 4*10^18 eV. The large collected statisticsof the showers measured by large-area muon detectors provides a sensitivity tophoton fractions < 10^-2, thus achieving precision previously unreachable atultra-high energies.

Constraints on the flux of primary cosmic-ray photons at energies E > 10^18 eV from Yakutsk muon data