The Los Angeles City Council voted unanimously Tuesday to ban the possession of firearm magazines that hold more than 10 rounds.

Mayor Eric Garcetti has already said he would sign the ordinance, which according to the council, will close a loophole in state law already banning the sale and manufacture of such magazines.

Anyone who owns the magazines will have 60 days to remove them from the city or turn them over to the Los Angeles Police Department for destruction, transfer or sale. Supporters of the measure believe it will help law enforcement officials prevent mass shootings in the city.

The current law exempts on-duty police officers, military members who are issued such magazines, firearms dealers and people who more than 15 years ago obtained high-capacity guns to hold 10-round magazines.

"Mass shootings have become so endemic that we can all recite a litany of places where they have occurred: Columbine, Isla Vista, Chattanooga — they've become part of lexicon," Paul Krekorian, the Democratic Council member who wrote the measure, said. "We've become desperate to find some solution to the destabilizing effect of the fact that we have to fear these sorts of mass killings."

Gun rights groups, such as the National Rifle Association are expected to challenge the measure legally.

( h/t the New York Times)