Roma are within two points of leaders
Montella opened the scoring after 18 minutes as he beat the offside trap, controlled the ball and fired past Reggina goalkeeper Enrico Belardi for his third of the season.
After Reggina's David Di Michele had a goal disallowed for offside, youngster Daniele De Rossi provided Carew the opportunity to slot home from close range by feeding the Norwegian with a cheeky flick nine minutes from time.
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