SAN SALVADOR, El Salvador — El Salvador’s widespread violence turned an unexpected corner with the brutal and fatal beating of the national zoo’s beloved hippopotamus Gustavito.

Even among a population numbed by a staggering human death toll from gang violence in recent years, the animal’s death late Sunday stirred outrage.

Salvadorans mourned through social media and some left flowers at the gate of the zoo, which has been closed until further notice.

“Here we’re used to seeing the dead every day,” Martin Castillo, a street vendor in the capital’s historic downtown, said Monday.

“They kill us like flies, but this tops it all. They killed an animal that only entertained us,” Castillo said.

Zoo director Vladan Henriquez said at a news conference that the hippo was covered with bruises and puncture wounds after apparently being attacked with metal bars, knives and rocks.

The attack occurred last week, sometime Tuesday night. But zookeepers did not discover the hippo’s injuries until Thursday because he did not leave his pool. Gustavito died the injuries late Sunday.

Justice Minister Mauricio Ramirez Landaverde said an investigation had been opened.