Finnish authorities suspect sabotage in Baltic Sea gas pipeline damage amid heightened security

Damage to Finnish-Estonian undersea gas pipeline likely caused by "outside activity," potentially a state actor.
Investigations ongoing, but authorities have ruled out an accidental explosion as the cause.
NATO promises support for member states Finland and Estonia and warns of "determined response" if sabotage proven.
Baltic states tighten security at energy facilities; pipeline damage raises concerns about critical infrastructure vulnerability.
Incident evokes memories of apparent attacks on Nord Stream pipelines; Russia disturbed but urges caution on ascribing blame.