Published: Mar 10, 2011 9:54 PM EST
Updated: Mar 10, 2011 6:54 PM EST

WASHINGTON- The Senate Judiciary Committee has approved a three-year extension of three post-Sept. 11 surveillance practices but voted to end another one. The panel opposed an investigative tool, known as national security letters, that compels businesses to turn over customer records without a judge's orders.

The legislation also includes new privacy and civil liberty safeguards for the Patriot Act provisions.

The measure, sponsored by committee Chairman Patrick Leahy, would extend through 2013 the use of roving wiretaps on multiple electronic devices. It also would extend authority to obtain court-approved access to business records considered relevant to terrorist investigations and secret surveillance of non-American "lone wolf" suspects not linked to specific terrorist groups.

It now goes to the full Senate. Without congressional action, the three provisions will expire on May 27.

(Copyright 2011 by The Associated Press. All Rights Reserved.)