A magnitude-6.3 earthquake shook a part of northwest Mexico Saturday, the National Seismological Service said, without reporting whether it had caused any damage.

The temblor occurred at 12:54 p.m. local time (1754 GMT) with its epicenter at 89 kilometers (55 miles) east of the city of Loreto in the state of Baja California Sur, and originated at a depth of 14 kilometers (9 miles) under the seabed of the Gulf of California, the National Seismological Service said, which at first had reported a magnitude-6.4 quake.

Luis Felipe Puente, national emergency services chief, said on his Twitter account that up to now no damages have been reported in Baja California Sur, nor in Sinaloa nor Sonora, which were also shaken by the quake.

At the same time he dismissed the need for a tsunami alert.

The Diario de Los Mochis newspaper in Sinaloa state reported on its Web site that "a lot of people were alarmed" and ran out into the streets, above all those who were in tall buildings. EFE