Nordic and Baltic seismologists said that they had detected blast-like waves on Sunday when a Baltic Sea gas pipeline ruptured but that the data was not strong enough to determine whether explosives were involved. Authorities in Finland and Estonia, whose state-run companies own and operate the Balticconnector pipeline, have said that the damage appeared to be caused by "mechanical force" and that it may have been a deliberate act. Norwegian seismology institute NORSAR, analysing data collected in Finland, said it identified "a probable explosion" near the pipeline on Sunday at 0120 EET (2220 GMT Saturday), matching operator Gasgrid's statement that pressure fell before 0200 EET.