"Racist shooting stirs up America's worst ghosts," writes Spain's El Pais.
The US events are "so shocking that they are unspeakable," writes Italy's La Stampa.
"Pain, fear and anger have engulfed America after the shooting, exacerbating the racial demons of a deeply fractured society," says Frederic Autran, the New York correspondent for France's Liberation.
Writing in Russia's popular Moskovskiy Komsomolets daily, Melor Sturua accuses Mr Obama of ducking the real issue by opting to describe the killings as "senseless" rather than "racist".
In Iran, the conservative Fars News Agency says that "racism is a dark phenomenon which has its roots in the heart of the American society".
The official Xinhua agency in China said the violence "mirrors the US government's inaction on rampant gun violence as well as the growing racial hatred in the country".
