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Prisoners cover themselves using makeshift shields as riot police agents (out of frame) fire rubber bullets during a riot at the Alcacuz Penitentiary Center near Natal in Rio Grande do Norte, Brazil last year. Photo: ANDRESSA ANHOLETE / AFP / Getty Images
Inmates who started a riot Sunday at the overcrowded Milton Dias Moreira prison in Rio de Janeiro took prison guards hostage, Reuters reports, citing an email from the Rio state penitentiary administration.
What's happening: Per Reuters, the email did not say how many guards are being held hostage or provide information on any deaths or injuries. This comes in the wake of a series of prison riots in the country amid a standoff between rival drug gangs. Reuters said the prison, built to hold fewer than 900 inmates, has more than 2,000.