[CentOS] Problem with yum update of device-mapper

I am seeing the following behaviour on all my ix86 CentOS-5.5 hosts:

Downloading Packages: (1/2): device-mapper-event-1.02.39-1.el5_5.2.i386.rpm | 20 kB 00:00 (2/2): device-mapper-1.02.39-1.el5_5.2.i386.rpm | 724 kB 00:02 http://centos.mirror.iweb.ca/5.5/updates/i386/RPMS/device-mapper-1.02.39-1.e...: [Errno -1] Package does not match intended download Trying other mirror.

The step 2 download repeats until the maximum number of mirrors has been tried and then the update fails.

I had previously run yum clean all before attempting the update.

Can anyone enlighten me as to the cause and remedial action required?

The favour of a direct response is requested as I am a digest subscriber.