  We measure the correlation between sky coordinates of the Swift BAT catalogue
of active galactic nuclei with the arrival directions of the highest energy
cosmic rays detected by the Auger Observatory. The statistically complete, hard
X-ray catalogue helps to distinguish between AGN and other source candidates
that follow the distribution of local large-scale structure. The positions of
the full catalogue are marginally uncorrelated with the cosmic ray arrival
directions, but when weighted by their hard X-ray flux, AGN within 100 Mpc are
correlated at a significance level of 98 per cent. This correlation sharply
decreases for sources beyond ~100 Mpc, suggestive of a GZK suppression. We
discuss the implications for determining the mechanism that accelerates
particles to these extreme energies in excess of 10^19 eV.
