Spam user registrations bypassing BuddyPress register page

Hello All,

I am running WP 3.3.2 Multisite and BP 1.5.5

I am getting spam user registrations that appear to be bypassing the BuddyPress register system. I have several fields setup, that are required. Spam user accounts are being created that do not have these fields filled out.

What can I do to stop these registrations?