SAN FRANCISCO (AP) _ The Federal Communications Commission is setting out to unravel the mystery behind the Internet traffic jams bogging down the delivery of Netflix videos and other online content.

The inquiry announced Friday by FCC Chairman Tom Wheeler will dissect the routes that video and other data travel to reach Internet service providers such as Comcast and Verizon.

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This crucial handoff of content has gained more attention in recent months as Netflix Inc. and other critics have accused Comcast and Verizon of deliberately slowing incoming traffic from websites unwilling to pay for a less congested entry point.

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Comcast and Verizon contend Netflix should bear some of the cost for handling the heavy traffic caused by its popular video service. Netflix reluctantly agreed to pay Comcast and Verizon earlier this year.

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