Consumer Watchdog urged U.S. antitrust agencies to block Google's acquisition of the social mapping company Waze, PC World reported.

Waze is an Israel-based maps app for smartphones that uses input from its users to display roadblocks, accidents and other hazards. Consumer Watchdog said Google's purchase would give the web titan an unfair advantage over its competitors.

The consumer company wrote a letter to both the U.S. Department of Justice and the U.S. Federal Trade Commission.

Read the letter to the Department of Justice and the FTC here.

"Google already dominates the online mapping business with Google Maps," wrote John Simpson, Consumer Watchdog's Privacy Project director. "The Internet giant was able to muscle its way to dominance by unfairly favoring its own service ahead of such competitors as Mapquest in its online search results."

Simpson added the acquisition would "allow Google access to even more data about online activity in a way that will increase its dominant position on the Internet."

Waze agreed to Google's $1 billion offer last week. The leading mobile maps developer reportedly beat Facebook and Apple in buying the Israeli startup.

Last May, at the All Things Digital Conference, Waze CEO Noam Bardin said Google was its biggest competitor in the mapping market.

"What search is for the Web, maps are for mobile," he said. "We feel that we're the only reasonable competition to [Google] in this market of creating maps that are really geared for mobile, for real-time, for consumers-for the new world that we're moving into."

Consumer Watchdog may have a case to block the sale on the grounds of violating the Clayton Act.

The antitrust law prohibits acquisitions of companies buy one company that "might substantially lessen competition or tend to create a monopoly in any line of commerce."

Regardless, Israeli entrepreneur Erel Margalit said the attention on Israel's creative output is beneficial.

"I think it's a big step forward," Margalit, who is also an opposition lawmaker in parliament, told the Associated Press. "Israel is no longer just a R&D center. It's a creative hub."

Read more about Google's acquisition of Waze here.