An antitrust investigation of Alphabet (GOOGL) - Get Report(GOOG) - Get Report is expanding to include more of its business practices, according to a published report Thursday.

50 state attorneys general, who represent the 48 U.S. states, Puerto Rico and Washington D.C., are preparing subpoenas that will focus on Google search and its Android platform, in addition to its advertising business, according to CNBC.

The investigation was formally announced in September by Texas Attorney General Ken Paxton, who emphasized Google's handling of user data and its dominant advertising business at the time. 

Alphabet intends to cooperate with the antitrust investigations, according to a statement by Google SVP of global affairs Kent Walker. Alphabet is also facing a DOJ review of its business practices. 

Alphabet shares closed 1% higher on Tuesday to $1,309.15 and are up 24% year to date. 

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