MIAMI (CBSMiami/CNN) - A magnitude six earthquake shook Puerto Rico Monday night, striking off the coast of the island in the Atlantic Ocean.

The quake hit about 49 miles north-northwest of Isabela, Puerto Rico, around 11:23 p.m., according to the United States Geological Survey.

At least three aftershocks have followed the quake including a magnitude 4.7, USGS said.

Puerto Rico Governor Wanda Vázquez Garced said in a tweet that there was no damage but a post on Twitter showed a water main break on the western part of the island.

There is no threat of tsunami from the quake, according to a tweet from The National Weather Service Pacific Tsunami Warning Center.

The magnitude six quake was the strongest to hit the island in recent years.

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