You don't plan operations like this in some safe house?

[Maggie]

Hi everyone,

Could you please give a fovor?

What's the meaning of "You don’t plan operations like this in some safe house"? This sentence is captured from a recent and big news about the Mumbai. I show some of the article, and I hope it's easier to let you guys tell me the real meaning. I ask it because I think native speakers can understand it and explain it more well. Because you know that all of the terms of the sentence I know, but the real meaning of the sentence I can't get it so far.

Some of the contents of the artilce as follows:

While cautioning that it’s still too early to draw firm conclusions about the identity of the attackers, Hoffman says the sophistication of the attacks, which required high levels of training, manpower, and logistical coordination, points to “outside planning.” The terrorists assaulted several targets simultaneously; they took and kept hostages; and they carried enough weapons and ammunition to fight for several days. Pulling this off would have required planning and practice.

“It’s not like planting a bomb,” he said. “You don’t plan operations like this in some safe house.”

Hoffman confirmed that links between Pakistan’s Inter-Services Intelligence spy agency and local Islamist terror groups are “very close,” but noted that this doesn’t mean the ISI played a role, or even knew about, the Mumbai attacks. “It could mean that far down the road in the past, these groups got the training they needed from the ISI,” he said.

Thanks for your help in advance.

Maggie^^
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[Mister Micawber]

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The attacks were too sophisticated to have been improvised quickly in a house used as a hiding place or refuge by members of the terrorist organization.
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Native English teacher at Mister Micawber's