A man who admitted robbing nine San Francisco banks has been sentenced to seven years in prison and ordered to pay restitution.

James Burge pleaded guilty in March to nine counts of unarmed bank robbery. On Monday, a federal judge ordered him to serve the prison time, pay nearly $31,000 in restitution and write letters of apology to each bank.

Authorities say Burge would approach bank tellers with a note demanding money and threatening to shoot if they didn't comply. The robbery spree lasted from November 2007 to March 2008.

Another defendant, Peter Juneau, pleaded guilty last month to 11 bank robberies in San Francisco, Los Angeles, Portland, Ore., and Seattle during the same time period. Juneau is serving a 63-month prison term.