Two strong earthquakes struck Puerto Rico within minutes of each other early Saturday.

The quakes, with magnitudes of 5.1 and 5.3 respectively, occurred three minutes apart just after 2 a.m. AST in the Mona Passage, just to the west of the island. A smaller aftershock was reported a few minutes later, and all were felt in the capital, San Juan.

The 5.1 quake was recorded at a depth of 14 kilometers (9 miles), while the 5.3 quake occurred at a depth of 17 kilometers (11 miles).

No tsunami alert was issued.