SBC Lost of connectivty to Canada?

[Elijah Savage <esavage () digitalrage org>]

On our SBC peering links we lost connectivty to our Canadian customers for about 20 minutes. I have escalated this up 
through SBC but was wondering if anyone on the list as any knowledge of what may have caused the outage. Our Canadian 
customers come in through different Canadian providers so from my perspective it wasn't just one AS or prefix that was 
lost it was many.

Thank You