Police shot and killed a man after he opened fire at a strip mall in southwest Houston and shot six people.

Nathan Desai

Police have identified the gunman as Nathan Desai, a Houston lawyer. Houston Police Chief Martha Montalvo said Desai was killed by police about 7 a.m.

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Montalvo said a possible motivation for the shooting was that Desai was facing "issues concerning his law firm." According to the Houston Chronicle, Desai previously worked with Kenneth P. McDaniel, a civil attorney, at the firm McDaniel & DeSai, LLP.

McDaniel, who said he worked with Desai for 12 years, told the Chronicle the partnership dissolved in February, but reports about Desai being disgruntled about the closing of the business were unfounded.

"I'm reading stuff online talking about how he was possibly a fired employee that was disgruntled," McDaniel said. "That's the farthest thing from the truth. Our partnership dissolved in February of this year — it was simply a matter of economics. We couldn't afford to operate as a partnership anymore."

Kenneth McDaniel, former Desai law partner: had positive working relationship for yrs, partnership dissolved in Feb due to economy #khou11 pic.twitter.com/kjx4P2iuxr — Drew Karedes (@DrewKaredes) September 26, 2016

Desai used a .45-caliber pistol in the shooting, and authorities found a long gun in his car. Authorities said he had more than 2,500 rounds of ammunition.

He was wearing military-style apparel with old Nazi emblems Houston Homicide Capt. Dwayne Ready said at a news conference. Vintage military items dating to the Civil War and other guns were found at his apartment.

EXCLUSIVE VIDEO: Shots fired as Houston Police confront suspect firing randomly near Weslayan, injuring nine. https://t.co/f9Vl1ZIgE6 pic.twitter.com/Y0xYj4esIt — ABC13 Houston (@abc13houston) September 26, 2016

Of the six people who were shot by Desai, one is in critical condition and one is in serious condition. Three people were treated for minor injuries at the scene and released.

The Houston Fire Department first announced an active shooter situation about 6:30 a.m. at a Petco in a strip mall in the 5400 block of Weslayan Street. Emergency vehicles closed down roads surrounding the strip mall.

Police declared a shelter-in-place for the Oaks at West University condominiums in the 4000 block of Law Street near the strip mall where the Desai's vehicle was located. A Houston bomb squad investigated the vehicle.

The shooter fired numerous rounds at authorities when they arrived at the scene. No firefighters or police were injured.

A spokesperson for the Houston Fire Department said several victims were transported to nearby hospitals. According to Houston police, injuries ranged from minor extremity injuries to serious injuries.

The Associated Press contributed to this report.