The US is still reeling from the mass shooting at a Colorado movie theater on Friday, and the government is scrambling to figure out how to combat the wave of mass shootings.
Here are the key questions about the shooting and the fallout.
How did the shooting start?
At 12:19 p.m. local time, a gunman opened fire on the crowded Century 16 theater in Aurora, Colorado, in what the FBI described as an act of terror.
A man with an assault rifle killed 12 people and injured 58 others.
The shooter, James Holmes, had been drinking and had taken prescription medications before he opened fire, according to the FBI.
The gunman is still on the run, though he is believed to be in a psychiatric facility.
The FBI said Holmes was in the process of being assessed by a psychiatrist at a psychiatric hospital in Aurora at the time of the shooting.
He had been treated for a mental health condition.
Two hours later, a shooter entered the Century 16 movie theater, killing six people and wounding 13 others.
Two people died and at least 20 others were wounded.
How many people were shot?
At least 19 people were killed in the shooting, but that number could be higher.
According to CNN, the shooter’s motive was not clear.
Investigators were working to determine if Holmes had any accomplices.
Authorities were still working to establish if he had any links to terrorism, the Associated Press reported.
There was no indication he had acted alone.
Holmes is being held at a mental hospital, according a law enforcement official familiar with the investigation.
Holmes’ parents and the family of his girlfriend, 23-year-old Elizabeth Lanza, were at the theater to watch a movie.
Was there a gunfight?
The suspect is believed in custody, according the AP.
However, witnesses reported hearing a gunbattle between the gunman and police.
A law enforcement source told the AP that “there were no active gun battles.”
However, law enforcement sources told the Associated Post that the gunman was “trying to make his way around the theater in a van with two guns in his hand.”
A law-enforcement source told NBC News that “the gunman was shooting randomly at random people.”
The suspect has not been identified, and no weapons were found.
The Associated Press also reported that “multiple law enforcement agencies are looking into whether he had a weapon, but there are no indications of any weapons.”
Law enforcement sources tell NBC News Holmes had purchased a gun from a pawn shop, but officials at the pawn shop said they did not know if the gun was stolen.
A source told ABC News the gun belonged to Holmes, who had pawned the gun before.
He told the pawn store it was stolen before he entered the theater.
How long was he under surveillance?
The FBI has been investigating the shooting since late May, when Holmes purchased two guns and a rifle from a private collector online.
A federal law enforcement officer told ABC news the weapons were purchased before the shootings and Holmes was under surveillance by the FBI as part of its investigation.
On May 14, a court approved a search warrant for Holmes’ apartment.
On that day, he had been living in the apartment with his girlfriend.
Police said he purchased two rifles and two handguns, along with ammunition.
In the days leading up to the shooting he had bought “several hundred” rounds of ammunition, and had posted videos of his activities online, including video of him entering the theater with the guns and shooting people, according on the AP report.
He was also under surveillance as he left the theater, police said.
Authorities have not said what led Holmes to his apartment.
How could he legally purchase guns?
The U.S. is still struggling to figure how Holmes purchased the weapons.
The law-firm law-review site, Lawfare, said Holmes purchased several guns legally, but only one was a semi-automatic rifle.
The website also said he also purchased a rifle with a high-capacity magazine.
The AP said the high-powered rifle was used in a recent mass shooting in Orlando, Florida.
The report also said Holmes bought a handgun, a Sig Sauer MCX, in late May.
He reportedly purchased the handgun after the mass shootings in San Bernardino, California, and Orlando, and it had a folding stock.
Lawfare also said that Holmes purchased a handgun in the Philippines.
However that weapon is not legal to purchase in the U.