The number of wiretaps secured in federal criminal investigations jumped 71 percent in 2012 over the previous year, according to newly released figures.

Federal courts authorized 1,354 interception orders for wire, oral and electronic communications, up from 792 the previous year, according to the figures, released Friday by the Administrative Office of the United States Courts. There was a 5 percent increase in state and local use of wiretaps in the same period.

The office collects the figures from federal and local jurisdictions at the request of Congress, but does not interpret the statistics. There is no explanation of why the federal figures increased so much, and it is generally out of line with the number of wiretaps between 1997 and 2009, which averaged about 550 annually. There was also a large number of wiretaps in 2010, when 1,207 were secured.