Amazon's cloud warning rattles investors

FILE PHOTO: The logo of Amazon is seen at the company logistics centre in Boves, France, August 8, 2018. REUTERS/Pascal Rossignol/File Photo

(Reuters) - Growth in Amazon.com Inc's lucrative cloud business is slowing and investors are worried.

Shares fell nearly 4% on Friday as Amazon's cloud business slowed in April after posting its weakest quarterly growth since the company began breaking out the unit's sales in 2015.