By Alistair Barr

SAN FRANCISCO (Reuters) - Amazon.com Inc reported solid first-quarter profits as the world's largest Internet retailer controlled shipping expenses and other costs, but international revenue growth slowed.

Amazon, which has been on a spending spree in recent years, posted declines in net income and operating profit, year over year. However, the company's gross profit margin, a closely watched measure of its profitability, came in at 26.6 percent, the highest in at least a decade, according to Scott Tilghman, an analyst at B Riley & Co.

"It's a very solid performance with a strong expansion of gross margins," Tilghman said.

Amazon has been building distribution warehouses closer to customers, reducing shipping costs. It also been charging third-party merchants on its marketplace higher fees for shipping services. In the first quarter, net shipping costs were 4.7 percent of sales, down from 5.1 percent a year earlier.

First-quarter revenue jumped 22 percent to $16.07 billion, propelled by growing sales of digital content, cloud-computing services and gains in its main retail business.

International revenue rose 16 percent in the quarter, year-over-year. In the same period of 2012, Amazon's international revenue climbed 31 percent, year-over year.

"International concerns are weighing on the company still. It's probably Europe mainly, given that the U.K. and Germany are the main markets for Amazon overseas," Tilghman said.

Amazon shares rose 1.6 percent to $279 in after-hours trading following the results.

Amazon forecast second-quarter revenue of $14.5 billion to $16.2 billion and operating results from break-even to $350 million. The latter guidance excludes stock-based compensation expenses and other items such as amortization of intangible assets.

Wall Street was looking for second-quarter revenue of $15.94 billion and operating results of $452 million, according to Mark Mahaney, an analyst at RBC Capital Markets.

(Reporting By Alistair Barr; Editing by Bernard Orr)

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