Comcast Corp. acknowledged "delaying" some subscriber Internet traffic, but said any roadblocks it puts up are temporary and intended to improve surfing for other users.

The statement was a response to an Associated Press report last week that detailed how the nation's largest cable company was interfering with file sharing by some of its Internet subscribers. The AP also found that Comcast's computers masqueraded as those of its users to interrupt file-sharing connections.

Internet watchdog groups denounced Comcast's actions, calling it an example of the kind of abuse that could be curbed with so-called "Net Neutrality" legislation. It would require Internet providers to treat all traffic equally — as has largely been the case historically.

Comcast has repeatedly denied blocking any Internet application, including "peer-to-peer" file-sharing programs like BitTorrent, which the AP used in its nationwide tests.

On Tuesday, Mitch Bowling, senior vice president of Comcast Online Services, added a nuance to that statement, saying that while Comcast may block initial connection attempts between two computers, it eventually lets the traffic through if the computers keep trying.