A group of 50 attorneys general from 48 states, the District of Columbia and Puerto Rico unveiled a major antitrust investigation of Google Monday, sharply escalating the regulatory scrutiny facing the tech giant.

The probe will focus on whether Google has harmed competition and consumers, looking at least initially into the company's conduct in its search, advertising, and other businesses, though it may expand from there.

The attorneys general of California and Alabama are the only two from all 50 states not participating.

The investigation significantly raises the risks of regulation for Google, which so far has faced antitrust scrutiny from federal lawmakers and the Justice Department. On Friday, Google disclosed in an investor filing that it has received a compulsory demand for information from DOJ.

The multi-state probe is the second such look into Big Tech to be announced within a week; on Friday, eight states and the District of Columbia said they have begun an antitrust investigation into Facebook.

This is a developing story. More to come...