Alexandria recorded its lowest crime levels in more than four decades last year, with homicides and assaults doing down, but some categories are on the rise.

Homicides decreased from three in 2010 to one last year; assaults dropped 10 percent year-over-year and larceny dipped by five percent, according to data released Monday morning by Alexandria police.

But rapes and robberies increased slightly, and auto theft went up by about 33 percent.

Alexandria’s only homicide victim last year was Bob Cory McNeely, 40, who was fatally shot on October 20. Alexandria resident Lenny Harris was last seen in Alexandria, but his body was found in Maryland, so his homicide was not counted in Alexandria’s tally.

Alexandria Police Chief Earl L. Cook released a statement saying he was happy with the 1.6 percent drop in overall serious crimes.

“I am pleased to announce that the City of Alexandria experienced yet another historic low for crime in 2011,” Cook said. “Our success in continuing to reduce crime and improve the quality of life in our neighborhoods is a direct result of the quality, hard work and dedication of our sworn, civilian and volunteer staff.”

This item has been updated to correct the identity of Alexandria’s 2011 homicide victim.