Radio galaxy M87 with the possible uG order magnetic halo might explain the observation. The AGASA's event clusters disfavor this idea but the model is very ``economical''. Extensive studies will be valuable to check the consistency.
The M87, a radio galaxy in the Virgo Cluster is located at 16 Mpc away from us. It belongs to the blue region in the figure shown below. You can see engergetic particles might be able to arrive at earth.