In story Feb. 15 about the Senate voting to extend antiterrorism measures, The Associated Press reported erroneously that a "lone wolf" provision in a 2004 law permits secret intelligence surveillance of non-U.S. individuals not known to be linked to a specific terrorist activity.

The law does require the government to convince a judge there is probable cause to believe that the person targeted for surveillance is engaged in or preparing terrorist activity. The government does not have to establish a connection between the person targeted for surveillance and a specific terrorist group.