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kc911stairclimbKANSAS CITY, Mo. — Federal Investigators have taken a Florida man into custody accused of planning a mass bombing in downtown Kansas City to commemorate the attacks of September 11.

According to the criminal complaint filed with federal courts, between July and September, an investigator gained the trust of Joshua Goldberg, 20, of Orange Park, Florida, through an online communication service. The communication took place between the federal investigator, (CHS) and Goldberg (AusWitness).

Authorities believe Goldberg planned to use a pressure cooker to assemble a bomb using shrapnel and other deadly materials. Goldberg was going to execute his plan during the Kansas City Memorial Stair Climb September 13 in downtown Kansas City.

Hundreds of fire fighters and first responders from the region gather at the Town Pavillion high-rise to climb to the top, honoring the heroes of the September 11, 2001 attacks in New York City.

Messages sent between the federal investigator and Goldberg on August 20 include:

7:03 a.m. AusWitness: Have you decided what kind of attack to carry out on 9/11, akhi? I was thinking a bombing.

7:06 a.m. AustWitness: We could make pipe bombs and detonate them at a large public event.

7:06 a.m. CHS: Yes I’m leaning towards that too. I’ve been getting excited about this. I’ve been having trouble with the planners in the dawlah who want me to just do a gun attack. But that doesn’t seem big enough to bring true glory to Allah. Look at Chattanooga the kuff have already forgotten.

7:07 a.m. AusWitness: Exactly, brother. It needs to be big. Do you live in NYC? I’m in Perth. There are lots of places to target here.

7:07 a.m. CHS: Do you know the directions you gave me work? I’ve never made a bomb before

7:08 a.m. AusWitness: They work, akhi. But a pressure cooker bomb might be even better. Let me ask one of my brothers in the dawlah for instructions.

Federal investigators further reviewed another conversation that took place August 24, in which Goldberg claimed to have found the “perfect place” to carry out the attack. Messages at a later date indicated a plan to dip the materials used in the pressure cooker bomb in rat poison to inflict the most damage.

Federal investigators took Goldberg into custody September 10. The Kansas City Memorial Stair Climb will proceed as originally scheduled.