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A strong 6.0 magnitude struck off the northwest coast of Puerto Rico late on Monday, the United States Geological Survey said, although no casualties or damage were reported.
The quake struck 62km northwest of San Antonio at 11:23 pm local time (03:20 GMT) at a depth of 10km, the agency said.
San Antonio is home to Rafael Hernandez Airport, a key air link to the mainland US.
In 2010 nearby Haiti was struck by a devastating 7.0 magnitude earthquake that killed more than 250,000 people and crippled the nation's infrastructure.
The quake struck just south of the island at a relatively shallow depth of 10 kilometres (over 6 miles), according to the US Geological Service. There was no tsunami threat, officials said.
Puerto Rico's governor declared a state of emergency on Tuesday after a powerful 6.4 magnitude earthquake killed at least one person in the south of the island and caused widespread damage.
When Ricardo Rossello took to Facebook at the 11th hour on 24 July to become the first Puerto Rican Governor to resign from office, he had been hit with 12 straight days of public protest. It was some 48 hours after a 500,000 strong crowd marched in the capital of a country with population of about 3.2 million. But the seeds of his political
Bing Image Creator integrated into Bing chat has started to roll out to Bing preview users, also it is available in Microsoft Edge from the Image Creator icon in the sidebar for both desktop and mobile users around the world in English.
The initiative reflects the wise leadership's keenness to provide assistance to affected families and alleviate their suffering ahead of the Holy Month of Ramadan.
The peninsula, seized by Russia from Ukraine in 2014, is home to Moscow's Black Sea Fleet and has been hit by a series of drone attacks since the Kremlin's offensive in Ukraine.