  Data from the Spitzer Space Telescope (the First Look Survey - FLS) have
recently been made public. We have compared the 24 micron images with very deep
WSRT 1.4 GHz observations, centred on the FLS verification strip (FLSv).
Approximately 75% of the radio sources have corresponding 24 micron
identifications. Such a close correspondence is expected, especially at the
fainter radio flux density levels, where star forming galaxies are thought to
dominate both the radio and mid-IR source counts. However, a significant
fraction of radio sources detected by WSRT (25%) have no mid-IR detection in
the FLSv (implying a 24 micron flux density less than 0.1 mJy). We present
initial results on the nature of the radio sources without Spitzer
identification, using data from various multi-waveband instruments, including
the publicly available R-band data from the Kitt Peak 4-m telescope.
