By Tom Fairless 

BRUSSELS--The European Union unveiled a signature plan to unite the region's fragmented online markets and crack down on possible abuses by U.S. Internet firms, a move policy makers hope will boost the economy and help spawn Internet giants to rival Google Inc. and Facebook Inc.

The plans, six months in the making, are a cornerstone of efforts by the EU's recently appointed executive arm to jump-start growth. They contain 16 initiatives ranging from an overhaul of the region's telecommunications rules to harmonized copyright and tax regimes to cybersecurity and even better parcel delivery.

Crucially, the plans call for several major inquiries into possible abuses by U.S.-based Web companies. These include a "comprehensive analysis" into the role of online platforms such as search engines and price comparison websites amid concerns around their market power, and a previously signaled probe by antitrust regulators into whether Internet commerce firms, like Amazon.com, are restricting cross-border trade.

Technology firms cautioned against heavy-handed new rules that could constrain Europe's ability to attract technology companies and to develop its own.

"Brussels appears poised to put government officials in charge of how hugely popular online services are designed and implemented," without any evidence that they are harming consumers, said Dean Garfield, president of the Information Technology Industry Council, a lobby group.

At the heart of the project is a determination to fight back against the dominance of the Web by U.S.-based companies. Top EU officials have warned that European firms are lagging behind in a critical sector that is squeezing traditional industries one after the other.

Write to Tom Fairless at tom.fairless@wsj.com

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