A strong earthquake, measuring 6.5 according to a US seismological agency, rocked Costa Rica late Sunday, but there were no immediate reports of damage or casualties.

The quake occurred at 8:28pm local (0228 GMT) on the Central American country's Pacific coast, at a depth of 20 kilometers (12 miles), close to the popular tourist beach town of Jaco. The Pacific Tsunami Warning Center did not issue a tsunami alert.