Police in Italy have arrested two American students.
They the pupils are connected to the killing of a policeman in central Rome.
According to a statement from Italian military police Carabinieri, the students are also being held for attempted extortion.
The students allegedly stabbed 35-year-old Mario Cerciello Rega to death on Friday.
Another police officer was injured in the incident.
South African police hunt suspects after 27 killed in two separate shootings
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Trump rejects Iranian proposal to open Hormuz and end fighting
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Helicopter crash kills 4 in Quebec
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