Sarasota Police confirmed a boy named Shawn Tyson was in custody accused of shooting dead James Cooper, 25 and 24-year-old James Kouzaris.
The bodies of the two young men were found in the early hours of Saturday morning in a rundown neighbourhood in the city, which is situated on the south-western coast of Florida.
The friends, who are former University of Sheffield students, were discovered by officers who were called to a residential street in the north of the city at around 3am.
Neighbours had reported hearing what sounded like machine gun fire.
One man was found lying on the ground outside a government-assisted housing block covered in blood.
The second victim was discovered moments later, lying 50ft away on the other side of the road.
Both men were pronounced dead at the scene from gunshot wounds, a Sarasota Police spokesman said. Read More