Washington (CNN) -- A law enforcement official confirms members of the Westboro Baptist Church, known for its controversial practice of picketing military funerals, participated in training for law enforcement officials at Quantico Marine Base in Virginia.

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The Initiative has also led to unprecedented bilateral anti-crime information sharing and collaboration, including the placement of vetted Mexican law enforcement professionals within EPIC and the Air and Marine Operations Center.

WHITEHOUSE: Strengthen International Partnerships

Marine officials said that according to initial reports, the alleged attacker was isolated in a barracks building by law-enforcement personnel before killing himself with a self-inflicted gunshot wound.

WSJ: Three Dead, Including Suspect, in Shooting at Quantico Marine Base