On June 8, 2026, classes were suspended in 12 coastal barangays of Pagadian City, Zamboanga del Sur, following a tsunami warning issued by the Philippine Institute of Volcanology and Seismology (Phivolcs). This advisory came after a magnitude 7.8 earthquake occurred near Sarangani at 7:37 a.m. Acting Mayor Lance Samuel Co announced the suspension of classes at all levels in barangays such as Poloyagan, Bomba, and Lumbia. Phivolcs has advised coastal communities in several provinces, including Davao Occidental and Sulu, to evacuate to higher ground due to potential tsunami threats. The City Disaster Risk Reduction and Management Office (CDRRMO) is monitoring the situation and will notify residents when it is safe to return to normal activities. Additionally, classes and government operations were suspended in Basilan province and Zamboanga City, and boat operations in these areas have been halted as a safety measure. Authorities emphasize the importance of remaining alert and following official advisories during this time.