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DENVER -- The Brady Center to Prevent Gun Violence will announce Tuesday a lawsuit against online retailers alleged to have sold ammunition and equipment to accused Aurora theater killer James Holmes.

“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.

The lawsuit will be filed on behalf of Sandy and Lonnie Phillips, whose daughter Jessica Ghawi was killed in the massacre. The official announcement was set to be made Tuesday in Denver.

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

Earlier this month, the Brady Center launched a national campaign against what they call “Bad Apple” gun dealers. The Center argues that just five percent of gun dealers account for nearly all of the guns used in crimes.