July 1 (Reuters) - The U.S. Federal Trade Commission is

seeking more details about SoftBank Group Corp's

planned $6.5 billion purchase of semiconductor designer Ampere

Computing, Bloomberg News reported on Tuesday.

The inquiry, known formally as a second request for

information, suggests the acquisition may undergo an extended

government review, the report said.

SoftBank announced the purchase of the startup in March,

part of its efforts to ramp up its investments in artificial

intelligence infrastructure.

The report did not state the reasoning for the FTC request.

SoftBank, Ampere and the FTC did not immediately respond to

a request for comment.

SoftBank is an active investor in U.S. tech. It is leading

the financing for the $500 billion Stargate data centre project

and has agreed to invest $32 billion in ChatGPT-maker OpenAI.