Police in the southern Lazio city of Frosinone on Sunday arrested a young man on suspicion of homicide in relation to a shooting on Saturday evening in which one person was killed and four more were injured, one of whom seriously.
The suspect, a 23-year-old Albanian national, is believed to have acted with three others, who are now being sought by police.
They are said to have arrived in a Lancia Ypsilon that was later abandoned and targeted the group sitting in a bar in Frosinone's central Via Aldo Moro.
The victims were all also Albanian.
Investigators believe the shooting may have been motivated by a turf war over control of the drug and prostitution rackets in Frosinone.
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