  The two brightest hard X-ray sources discovered serendipitously by Chandra in
the field of the lensing cluster A2390 are found to have ISOCAM counterparts at
6.7 and 15 micron. We use this fact, together with their non-detection by SCUBA
at 850 micron, as the basis for DUSTY radiative transfer modelling of their
infrared spectral energy distributions. For the best-fitting models, we find
that the dust which reprocesses the optical--UV light in these Compton-thin AGN
is heated to near its sublimation temperature (above 1000K), with an inner
radius within a parsec of the nucleus. Some warm dust models with inner
temperatures of 200K are also formally acceptable. These findings strongly
support the obscured AGN hypothesis for the new hard X-ray Chandra sources,
which lack both strong emission lines and 850 micron SCUBA detections.
