  We present the results of the longest yet undertaken search for apparently
extragalactic radio bursts at the Bleien Radio Observatory covering 21000 hours
(898 days). The data were searched for events of less than 50 ms FWHM duration
showing a $\nu^{-2}$ drift in the spectrogram characteristic of the delay of
radio waves in plasma.
  We have found five cases suggesting dispersion measures between 350 and 400
cm$^{-3}$ pc while searching in the range of 50 -- 2000 cm$^{-3}$ pc. Four of
the five events occurred between 10.27 and 11.24 a.m. local civil time. The
only exception occurred at night with the full moon in the beam. It was an
event that poorly fits plasma dispersion, but had the characteristics of a
solar type III burst. However, we were not able to confirm that it was a lunar
reflection. All events were observed with a log-periodic dipole within 6800
hours but none with a more directional horn antenna observing the rest of the
time.
  These properties suggest a terrestrial origin of the "peryton" type reported
before. However, the cause of these events remains ambiguous.
