  Let $Z=X_1\times...\times X_n$ be a product of Drinfeld modular curves. We
characterize those algebraic subvarieties $X \subset Z$ containing a
Zariski-dense set of CM points, i.e. points corresponding to $n$-tuples of
Drinfeld modules with complex multiplication (and suitable level structure).
This is a characteristic $p$ analogue of a special case of the Andr\'e-Oort
conjecture. We follow closely the approach used by Bas Edixhoven in
characteristic zero, see math.NT/0302138. Note that in this paper we assume
that the characteristic $p$ is odd, and we only treat the case of Drinfeld
$F_q[T]$-modules.
