Salmo,

The tool that grumpyr spec'd should do it, will require a little muscle though. If I thought I lived closer, I'd let you borrow mine. You may be able to rent a longer handled version from your local tool rental shop, the longer handles will obviously make it child's play. Hacksaw/jigsaw/sawzall may work, but aluminum has a tendency to foul the teeth on your blade.
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"Gentlemen, you can't fight in here, this is the War Room!"
President Merkin Muffley