This all depends on the physical architecture used for the said circuit. I don't know how frequently SONET is used these days on HiCap and Tier-1 circuits, but if your network is designed using what is known in the industry as UPSR (Unidirectional Path Switched Ring), there is a redundant path on another circuit that can handle the traffic around the disabled / failed segments of a SONET ring. If the fibers were located (physically) close to each other (which is not a good, secure practice), then this would be a huge problem, and the segments within the failed portion of the ring would be "in-wrap" so segments at either end of the failed sections would still have signal, and therefore, service. Multiple fiber cuts, as were reported, might have been done to intentionally disable this in-built service protection of UPSR. If there were 3 cuts, as reported, this would had to have been a coordinated & direct attack on the carrier's infrastructure.