NUKU'ALOFA, Tonga -- An earthquake measuring magnitude 7.7 struck off the coast of Tonga early Friday, officials said.

The Pacific Tsunami Warning Center issued a regional tsunami warning for Tonga, Fiji, Niue, the Kermadecs, American Samoa, Samoa and Wallis-Fatuna.

The quake's epicenter was about 213 kilometers (132 miles) south-southeast of Nuku'alofa, Tonga. It struck at 6:17 a.m. local time (6:17 p.m. GMT).

The warning center said in a statement. "Some coastal areas in Hawaii could experience small non-destructive sea level changes and strong or unusual currents lasting up to several hours."