The council's unanimous vote comes as officials try to comply with last month's U.S. Supreme Court ruling that struck down the city's 32-year-old ban on handguns.

The emergency legislation will allow handguns to be kept in the home if they are used only for self-defense and carry fewer than 12 rounds of ammunition.

Handguns, as well as other legal firearms such as rifles and shotguns, also must be kept unloaded and disassembled, or equipped with trigger locks — unless there is a "reasonably perceived threat of immediate harm" in the home.

"This is not perfect legislation," said D.C. Council member Phil Mendelson, who worked with the mayor's office on the bill. "The first step is what we have before us today so that we maintain important provisions in our gun registration law while we continue look at how we can further refine our gun registration law."

Gun rights groups, including the National Rifle Association, said at least some of the new regulations will likely be challenged. The bill that passed Tuesday maintains the city's unusual ban of machine guns, defined as weapons that shoot at least 12 rounds without reloading, which applies to most semiautomatic firearms.

The emergency legislation will remain in effect for 90 days, and the council expects to begin work in September on permanent legislation.

Though residents can begin applying for handgun permits this week, city officials have said the entire process could take weeks or months.