AT&T Inc. agreed to buy the consumer fiber operations of Lumen Technologies Inc. for $5.75 billion, expanding its fast broadband service in major cities like Denver and Las Vegas. AT&T will pay cash for the unit of Lumen,

The US broadband market is rapidly consolidating, leaving fewer choices as six of the top 10 internet providers were involved in recent acquisitions.

The Dallas-based telecom giant AT&T is making a play for a fiber network that will help it expand is reach by millions.