I would say probably not because the symptoms described do not
match
fire blight. Indian hawthorns may not be hawthorns, but they
are
related, and they are vulnerable to fire blight.

Related, as in Rosaceae? OK, but that's a pretty big group, I
can't find any indication that they are placed anywhere near
Crataegus, so the relationship seems pretty distant.

And I've only seen leaf spot on Raphiolepis (or Rhaphiolepis).
Dirr mentions leaf spot, but NOT fire blight.

(?)

Jim Lewis - - Tallahassee, FL - Where the
Indian "hawthorn" is just barely hardy.