Amazon.com Inc. (AMZN) said video streams on its Prime Instant Video service nearly tripled year-over-year, helped along by the company's heavy spending on original shows and new content.

"We've invested hundreds of millions of dollars in great TV shows and movies for Prime members and it's working," said Bill Carr, vice president of digital video and music for Amazon.

The announcement comes about a week after Amazon unveiled a $99 set-top box, called Fire TV, for streaming video and games, which should allow the company to reduce its dependence on other hardware manufacturers such as Roku Inc. to deliver its streaming-video service to televisions.

Amazon has been pushing more aggressively into streaming video to compete with Netflix Inc. (NFLX), with shows like political comedy "Alpha House." Last month it selected a new slate of original programs it will produce for prime subscribers and is weighing an ad-supported video service with additional content that may be available to a broader swath of consumers, people familiar with the matter recently said.

Write to Ben Fox Rubin at ben.rubin@wsj.com

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