FILE PHOTO: The logo of Amazon is seen on the door of an Amazon Books retail store in New York City, U.S., February 14, 2019. REUTERS/Brendan McDermid

(Reuters) - U.S. Federal Trade Commission (FTC) has broadened scrutiny of Amazon.com Inc beyond its retail operations to include cloud-computing business, Bloomberg reported on Wednesday, citing people familiar with the matter.

The U.S. antitrust enforcers have been asking software companies about practices around Amazon’s cloud unit Amazon Web Services, the report said.

Big tech companies such as Facebook Inc, Alphabet Inc’s Google, Apple Inc and Amazon face a slew of antitrust probes by the federal government, state attorneys general and congress.

FTC’s Technology Enforcement Division was focusing its probes of multi-sided platforms on illegal conduct and mergers that previously won antitrust approval.

FTC and Amazon declined to comment on the report.

In cloud computing, one of the fastest-growing areas in the technology industry, businesses rent out servers from Amazon instead of running their own data centers.

Amazon is the biggest cloud services provider, competing most closely with Microsoft Corp. Smaller companies also compete to provide services on cloud networks to developers and corporate customers.

Analysts expect Amazon’s cloud unit to generate $34.9 billion in sales in 2019, according to IBES data from Refinitiv.

In addition to the FTC probes, the Justice Department and House of Representatives Judiciary Committee are investigating all four big tech companies.