SAN JUAN, Puerto Rico — Jamaican police have arrested at least six suspects in connection with a mass shooting in which eight people were recently killed in the island’s southern region.

The most recent suspect was arrested late Thursday, police said in a statement.

Seven of the victims were killed in one shooting and an eighth one was killed in a related shooting shortly afterward, authorities said. Among the victims was a 7-year-old boy.

Nine other people were injured in the first shooting Sunday at a birthday party in the parish of Clarendon, located west of the capital of Kingston. Among those injured was a baby.

Deputy Police Commissioner Fitz Bailey has said the shootings were a result of long-standing feuds among former friends who had a falling out in the U.S. “over illegally obtained gains, leading to each taking homicidal contracts to incite fear and terror.”

The shootings prompted Jamaican Prime Minister Andrew Holness to declare a state of emergency as he warned about possible reprisal killings.

Last year, Jamaica was ranked the second-deadliest country in the Caribbean and Latin America, with nearly 61 killings per 100,000 people, according to Insight Crime.

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Newsday Investigates: Girl was absent, late in half the school days in months before death ... University says hazing victim responsible for own injuries ... Crossing the Island in one day on public transportation ... Let's Go: Catskill Mountain Railroad

University says hazing victim responsible for own injuries ... Sanitation truck enthusiast gets 4th birthday surprise ... Out East: Safe space for animals Credit: Newsday

Newsday Investigates: Girl was absent, late in half the school days in months before death ... University says hazing victim responsible for own injuries ... Crossing the Island in one day on public transportation ... Let's Go: Catskill Mountain Railroad

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