SAN JUAN – A 5.4-magnitude earthquake struck near southern Puerto Rico on Saturday, briefly knocking out power and forcing the relocation of at least 50 families on an island where some people still remain in shelters from previous quakes earlier this year. Most of the damage was reported in Ponce, where officials were still going neighborhood by neighborhood to assess damage as rescue crews fanned out across the region. “The infrastructure is already weak.”Several aftershocks hit Puerto Rico's southern region, including a 4.9-magnitude one. Nerves are already frayed in many parts of the island as Puerto Rico continues to recover from Hurricane Maria, a string of strong earthquakes and the coronavirus. Silvestre Alicea, a 67-year-old man who moved back to Puerto Rico from New York upon retiring, lost his home in January's earthquake and is still living with his sister in Guanica.