Amazon has reported a 12-fold increase in its second-quarter profits driven by demand for Amazon Web Services and increased online sales.

The online retailer recorded net income of $2.5bn (Ā£1.9bn) in the quarter ending on June 30, up from $197m (Ā£150.4m) during the same period the previous year.

Operating income more than quadrupled to $3bn (Ā£2.3bn) during the period, up from $628m (Ā£480m) the previous year.

Sales surged 39% year on year to $52.9bn (Ā£40.4bn), bolstered by a 44% jump in retail sales in North America to $32.2bn (Ā£24.6bn) and nearly 50% worth of increased sales of its cloud services arm Amazon Web Services to $6.1bn (Ā£4.6bn).

Sales across the retailer’s ā€œotherā€ categories, which includes advertising revenue, also more than doubled to $2.2bn (Ā£1.7bn).

Amazon’s chief financial officer Brian Olsavsky hailed the results as ā€œa strong quarterā€, which he attributed to the ā€œcontinued strength in some of our most profitable areasā€.

Chief executive Jeff Bezos said: ā€œWe want customers to be able to use Alexa wherever they are.

ā€œThere are now tens of thousands of developers across more than 150 countries building new devices using the Alexa Voice Service, and the number of Alexa-enabled devices has more than tripled in the past year.ā€