Police distinguished the shooter as 59-year-old John Houser, a white man initially from Alabama.
He had been staying at a motel in Lafayette, Louisiana where powers discovered glasses and wigs for masks.
"He's sort of a stray," police boss Jim Art told journalists, including that Houser acted alone.
Houser clearly attempted to escape the theater subsequent to shooting 13 rounds from a solitary handgun, murdering two white females matured 21 and 33, one of whom kicked the bucket in healing facility, and harming nine others before executing himself as police shut in.
"What happened is that the brisk law authorization reaction constrained him again into the theater, at which time he shot himself," Specialty said.
Louisiana state police boss Michael Edmonson said they were exploring Houser's thought process, and had identified with his loved ones.
Notwithstanding the masks, police said Houser had exchanged the tag on his auto, which was stopped bear the theater exit.
More than 100 individuals were in the film when Houser started shooting aimlessly into the group of onlookers around 30 minutes into a screening of "Trainwreck."
One individual stays in discriminating condition in healing facility, Art said.
Houser has been in the southern city of around 125,000 individuals since right on time July, as indicated by Art.
Houser's evident LinkedIn profile demonstrated a shifted profession, with involvement in speculation administration, land and stretches as a bar proprietor.
Louisiana senator Bobby Jindal said it didn't create the impression that the casualties were focused on and said occupants were dealing with the "arbitrary demonstration of roughness."
"There's never a decent clarification. For this situation, the clarification will be not as much as in different cases in view of what they realized by conversing with relatives and handling that inn room and auto," Jindal said on CNN.
He commended an educator who tossed herself before the shower of shots to ensure her companion, likewise an instructor, and in the long run pulled the discharge alert.
The second instructor said the projectile was desiring her head on the off chance that her companion hadn't hopped on top of her.
"She had the vicinity of brain to pull the discharge caution," said Jindal, who is likewise competing for the Republican presidential selection Jindal, who raced to Lafayette after news of the shooting rose, said it was not the correct time to examine firearm control and that the attention ought to stay on the casualties.
'Mayham all over the place'
The shooting came as President Barack Obama conceded that a "troubling" absence of advancement on weapon control has been an extraordinary wellspring of dissatisfaction amid his time in office.
"On the off chance that you take a gander at the quantity of Americans slaughtered since 9/11 by terrorism, it's under 100. In the event that you take a gander at the number that have been murdered by firearm viciousness, it's in the many thousands," Obama said in a meeting with the BBC taped before the shooting.
"Furthermore, for us not to have the capacity to determine that issue has been something that is upsetting," he said.
The White House said the president was informed late Thursday while on the way to Kenya about America's most recent mass shooting catastrophe.
"The president guided his group to keep him upgraded on the examination and on the status of those harmed," White House representative Josh Sincere said in an announcement.
"The considerations and requests to God of everybody at the White House, including the president and first woman, are with the group of Lafayette, Louisiana - particularly the groups of the individuals who were slaughtered."
The most recent frenzy ejected as a jury thinks capital punishment for the shooter in a 2012 theater slaughter in Colorado that left 12 dead and 70 harmed.
Exactly three years prior, James Holmes, 27, opened fire on a pressed screening of "The Dim Knight Ascends" in Aurora, Colorado, in a fastidiously arranged assault amid which he wore body shield and utilized nerve gas to keep casualties from getting away.
The shooting additionally comes a week after Mohammad Youssuf Abdulazeez, 24, opened fire on two military focuses in Chattanooga and slaughtered four US Marines and a Naval force mariner before kicking the bucket in a shootout without police.
TV pictures from Lafayette demonstrated a riotous scene at the film, encompassed late Thursday by many crisis restorative vehicles and squad cars.
"It was insane, mayham all over the place," witness Jacob Broussard told CNN.
Broussard was watching a motion picture over the lobby when the alarms sounded and the lights went ahead.
A voice came over the radio requesting that individuals clear the building as fast as could be expected under the circumstances. As he was leaving, Broussard heard three shots. When he got outside, he saw a lady draining from the leg.
Entertainer Amy Schumer, who stars in "Trainwreck" quickly offered her sympathies.
"My heart is broken and every one of my musings and requests to God are with everybody in Louisiana," she tweeted.