A key Congressional committee dealt a major blow to Mayor Michael R. Bloomberg’s campaign against illegal firearms yesterday, refusing to allow police departments broader access to data that tracks guns sales.

The bill restricting release of the information, approved by the House Appropriations Committee, must still be passed by the full House and reconciled with a similar Senate measure. But since the Senate bill is considered even more beneficial to the gun industry, the Bloomberg administration appeared resigned to defeat.

A loss for Bloomberg on gun control is always good news.