(CNN) Latest developments (all times in ET)

11:16 p.m. : The weapon used in the shooting was a handgun, said police Sgt. Brooks David.

10:52 p.m.: Authorities said they know the identity of the shooter but are withholding it so as not to "affect the integrity" of the investigation.

10:45 p.m.: He is a 58-year-old white male who was a theater patron fired multiple shots, said Col. Michael Edmonson of the Louisiana State Police. The shooter was acting alone and is deceased, he said. There were about 100 people inside at the time.

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A man opened fire inside a movie theater in a Lafayette, Louisiana, multiplex, Thursday night, killing two people and wounding seven others -- before taking his own life.

"There's nothing to believe that there was any kind of motive," said Col. Michael Edmonson of the Louisiana State Police.

The shooter was a 58-year-old white man who was a theater patron, police said. Authorities have his name but are withholding it as the investigation continues.

The shooting took place shortly before 8:30 p.m ET at the Grand Theatre 16 in Lafayette, a city of about 120,000 people, 60 miles west of Baton Rouge.

About 100 people were inside the theater for a screening of the comedy, "Trainwreck," when the shooter began firing using a handgun, police said.

Photos: Movie theater shooting in Lafayette, Louisiana Law enforcement personnel stand near a police line at The Grand Theatre following a deadly shooting in Lafayette, Louisiana, on Thursday, July 23. The shooter in the Lafayette movie theater shooting died of a self-inflicted gunshot wound according to Louisiana State Police. Hide Caption 1 of 7 Photos: Movie theater shooting in Lafayette, Louisiana Louisiana Gov. Bobby Jindal, center, speaks with the media near the scene. Hide Caption 2 of 7 Photos: Movie theater shooting in Lafayette, Louisiana Federal investigators arrive. Hide Caption 3 of 7 Photos: Movie theater shooting in Lafayette, Louisiana Lafayette Police Department and Louisiana State Police units block an entrance road near the scene of the shooting. Hide Caption 4 of 7 Photos: Movie theater shooting in Lafayette, Louisiana A Lafayette Police Department vehicle blocks an entrance at The Grand Theatre. Hide Caption 5 of 7 Photos: Movie theater shooting in Lafayette, Louisiana Police tape surrounds the scene. Hide Caption 6 of 7 Photos: Movie theater shooting in Lafayette, Louisiana Police and emergency vehicles at the scene of the shooting. Hide Caption 7 of 7

'Gunshots after gunshots'

Jalen Fernell said he was in a theater next door.

"I almost thought it was part of the movie at first," he said of the gunshots.

An alarm went off, followed by an overhead intercom message asking patrons to get out.

"Immediately we get terrified because they are telling us to head out to vehicles," he said. "It was kinda like a war going on ... gunshots after gunshots."

Paige Bearb, another witness, said she took off running when the alarm sounded.

"I saw people bleeding from the leg, they were shot," she said. "And I was like 'Wow.' It was like a movie itself."

Wanted to let everybody know I'm safe. I was in The Grand parking lot when cops arrived. It's worse than it looks on TV. Praying #Lafayette — ML1 Media (@mightylions1) July 24, 2015

'Awful night for the United States'

Four officers entered the theater and found the gunman dead.

"It appears the shooter died from a self inflicted gun shot wound after discharging his weapon numerous times," said Lafayette Police Chief Jim Craft.

The extent of those who were injured range from critical to non-life threatening, he said.

Bomb squads conducted a sweep of the theater and the parking lot. Police temporarily closed a nearby Grand theater and deployed officers to other movie houses as a precaution.

They determined the gunman acted alone and there was no additional threat.

"Whenever we hear about these senseless acts of violence, it makes us both furious and sad at the same time," said Louisiana Gov. Bobby Jindal, from the scene of the shooting.

"This is an awful night for Lafayette, this is an awful night for Louisiana, this is an awful night for the United States. But we will get through this."

'My heart is broken'

The shooting occurred six days after the conviction of James Holmes in the Aurora, Colorado, theater shooting that left 12 people dead and 70 people wounded.

On July 19, 2012, Holmes opened fire during a screening of "The Dark Knight Rises" using an AR-15 rifle, a 12-gauge shotgun and at least one .40 caliber handgun. The shooting stopped with Holmes' arrest outside the theater about seven minutes after the first 911 calls were made to police.

Late Wednesday night, Amy Schumer, the star of the movie "Trainwreck" tweeted, "My heart is broken and all my thoughts and prayers are with everyone in Louisiana."

My heart is broken and all my thoughts and prayers are with everyone in Louisiana. — Amy Schumer (@amyschumer) July 24, 2015

While the shooter may have taken his motive with him with his death, the investigation is far from complete.

Authorities will put together a profile on the shooter, search his house and trace the gun, said CNN legal analyst Sunny Hostin.

For now, said Gov. Jindal, "we can pray.

"We can hug these families. We can shower them with love, thoughts and prayers."