Former Los Angeles Police Chief William J. Bratton told CNN Friday that the country needs "some sanity in our gun control laws."
"Gun control can reduce these numbers of incidents," said Bratton. "These incidents will continue to occur. We are a country in love with our guns."
He said the suspect in the Colorado mass shooting should not have had access to the AR-15 rifle police suspect he used.
Bratton, chairman of Kroll Advisory Solutions, which provides risk consulting, said he doubted Friday's incident will have much immediate impact on gun laws.
"Neither the president nor the presidential candidate or Congress have shown any interest to take on the NRA on this issue."
Los Angeles Mayor Antonio Villaraigosa also is among those calling for tougher federal gun controls.
"It's time for the federal government to again ban these weapons, just like California enacted the nation's toughest law against assault weapons nearly two decades ago," he said in a statement. "Our lawmakers need to come together and do more than just talk about the pain and sorrow in the aftermath of these gun violence tragedies. They need to act.''
The NRA said in a statement: "Our thoughts and prayers are with the victims, their families and the community. NRA will not have any further comment until all the facts are known."
Friday's shooting in Aurora, Colorado, occurred during a midnight showing of the new Batman movie, "The Dark Knight Rises" -- which itself struggles with the theme of guns and violence.