WASHINGTON: Amazon said Thursday profits edged up to $2.6 billion in the past quarter amid strong revenue gains for the US online giant.

Revenues rose 20 percent to $63.4 billion in the April-June period for the company, a dominant force in retail with its Prime subscription service.

"Customers are responding to Prime's move to one-day delivery -- we've received a lot of positive feedback and seen accelerating sales growth," said chief executive Jeff Bezos.