The Brady Center to Prevent Gun Violence is filing a lawsuit against online retailers that allegedly sold ammunition to James Holmes, the suspect accused of the Aurora theater killings.

“The lawsuit alleges that the websites negligently supplied Holmes with the arsenal he used to kill 12 people and wound at least 58 others by failing to use any screening mechanism to determine his identity or intent for the products,” the Brady Center said in a media release, Fox-affiliated KDVR reported.

The lawsuit comes as the Brady Center continues its “Stop Bad Apple Gun Dealers” campaign, which seeks to target those who “supply guns to criminals by selling them to straw purchasers (people buying guns for others), gun traffickers (people buying guns to illegally resell), and other dangerous people,” according to its Web page.

The lawsuit in the Aurora, Colorado, case will be filed on behalf of Sandy and Lonnie Phillips, whose daughter Jessica Ghawi was killed on July 20, 2012, when Mr. Holmes allegedly gunned down 12 people at a Century movie theater. The official announcement was set to be made Tuesday in Denver, KDVR reported.

The Brady Center said it plans to name Lucky Gunner, at BulkAmmo.com, as well as other online weapons sellers in the lawsuit, the station said.

Lucky Gunner couldn’t be reached for comment.

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