MOSCOW -- A series of powerful earthquakes struck off the coast of Russia's Kamchatka Peninsula on Sunday, with the strongest reaching magnitude 7.6, according to the Kamchatka branch of the Unified Geophysical Service of the Russian Academy of Sciences.

The region has since experienced nearly 30 aftershocks, ranging in magnitude from 4.0 to 6.7, authorities said.

Russia's Ministry of Emergency Situations initially issued a tsunami warning, urging residents to evacuate coastal areas. The warning was later lifted.

No casualties or major damage have been reported.

Twenty-two inspection teams surveyed key infrastructure, including schools, energy facilities, and water and heating systems in affected areas. All economic and public services, such as utilities, electricity, medical facilities and boiler houses, are operating normally, officials said.