1993 World Trade Center Bombing as a precursor of 9/11/01

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Could the destruction of the World Trade Center on September 11th 2001 have been predicted by astrologers?

I would argue that, technically, yes but it would have been difficult and not as clear cut as it seems without the benefit of hindsight.

My basis for this rests in analysis of the figure erected for the first World Trade Center Bombing on February 26th 1993 at 12.17.37pm. According to the wikipedia article on this topic: The 1993 World Trade Center bombing occurred on February 26, 1993, when a truck bomb was detonated below the North Tower of the World Trade Center in New York City. The 1,500 lb (680 kg) urea nitrate?hydrogen gas enhanced device[1] was intended to knock the North Tower (Tower One) into the South Tower (Tower Two), bringing both towers down and killing thousands of people.[2][3] It failed to do so, but did kill six people and injured 1,042.
News report from the time: http://www.youtube.com/watch?v=ML-yDan5Pkc

The chart for this event is shown below:
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Mars rising in Cancer describes the bombing as an attack on the common people, Mars having dignity by bound although in detriment. The ruler Moon/Taurus is exalted in the 11th - the bombing almost succeeded and the towers would eventually be demolished indicating that the natal potential for this exists. Key to this delineation is that the 11th house is a place where things grow, increase or accumulate with time (eventually reaching the peak of the 10th by diurnal motion). From wikipedia: The towers did not collapse, according to Yousef's plan, but the explosion did damage the garage badly. Nevertheless, had the van been parked closer to the WTC's poured concrete foundations, Yousef's plan might have succeeded.

The next most important consideration in the chart shown above is delineating IC/Virgo as the foundations and structural integrity of the WTC.
Ruler Mercury/Pisces/9th is a bad sign and indicates dissolution/weakening of the buildings foundations and structural integrity.
The 9th falls away from the peak of the 10th - the 9th indicates collapse (see for example Saturn/Gemini/9th for the figure of the first plane hit, Saturn/Gemini = TWIN towers, falling = 9th and a general signification of Saturn).
As an aside, I have also noted Regulus on the Lot of Fortune and Saturn/Aquarius/8th in partile square to the 2000 Jupiter-Saturn conjunction.

The chart for the 1993 bombing progressed to September 11th 2001:
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Two striking features of this chart: The most obvious is the almost precise Mars-Asc conjunction. This would be a red flag for some sort of second attack, but a key to delineating destruction of the towers is seen by the progressed Moon's ingress into Virgo - sign of the IC (delineated above as the buildings foundations and structural integrity). The Moon entered Virgo only 4 days prior to 9/11. As ruler of the Asc-Mars conjuntion in Cancer, the Moon reaching the sign of the IC brought an attack leading to collapse, as ruler Mercury is now retrograde, 1 degree away from opposition to the IC, in detriment in the 9th and moving to combustion.

In summary, the natal potential for destruction of the WTC existed in the 1993 bombing chart and it manifested on 9/11/01 in the progressed chart.

Edit:
The exact date of Prog. Asc to Prog. Mars is October 21st 2001, or 40 days after 9/11, the orb being 4 minutes.

If one was aware of such a progression and predicted some major incident at the WTC in the summer or fall of 2001 (allowing an orb), the astrologer would next look at the 2001 ingress charts for NYC and see if anything ominous* sticks out. If so, the time could be further narrowed down by looking for ominous lunations in the relevant time period.

*2 main things:
1. Angular malefics, especially if one tightly conjunct or opposed the rising degree. Saturn is more malefic than Mars. Uranus counts. For example, Uranus on the rising degree in the ingress figure preceding the Nagasaki nuclear bombing). Another example is Saturn/Cancer exactly on the rising degree of the 2004 Capricorn ingress in Thailand preceding the December 26th Indian Ocean Tsunami.
2. Moon in a malefic configuration. Easiest to spot if separating from one malefic and applying to the other - orb must be tight (the tighter the orb, the more likely some significant negative event will occur). An example: See the Aries ingrees for Los Angeles in 1992 preceding the rioting where Moon separates from Saturn and tightly applies to Mars. Saturn and Mars were angular (in the rising sign, Aquarius) in the same ingress in New York (1993 WTC bombing happened under this ingress). Planet can also be accidental malefic - see Venus/Aries/12th in the chart below.

So, lets have a look at the 2001 Aries ingress for New York city:
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Saturn is exactly on the rising degree, in a degree associated with Algol, the most violent star in the heavens (Algol mythology: Algol has mythology of its own, none of it complimentary. Its full Arabic name is Ras al-Gul, the Ghoul?s Head. Algol has also been known as the Demon Star and the Blinking Demon. The Jews called it Rosh ha-satan, Satan's Head, while in the Talmud it is labeled Lilit, Adam?s legendary first wife and a demon. The Chinese name is certainly the most gory, "Tseih She", which means the Piled- up Corpses. Source: http://www.sky-watch.com/astronomy-guide/perseus.html).

Saturn rules the Moon, separating from an afflicted Jupiter/Gemini and applying to the Asc ruler, Venus/Aries/12th, and Venus is in a tight trine aspect her ruler, Mars/Sagittarius/8th.

This is certainly a very malefic ingress figure, which holds all throughout the year (March 20th 2001 - ~March 20th 2002) because a fixed sign is rising.

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Coming up to the 10th anniversary, I'd like to see what other mundane factors should be considered.

Maybe the 2000 Jupiter-Saturn conjunction? Eclipses? Other?

Edit: According to Abu Mashar, the Aries ingress preceding the Jupiter Saturn conjuntion should be examined to see what potential events may unfold for that location over the next 20 years. This chart is shown for New York:
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Mars/Aries/4th with Sun/Aries ruling the 8th of death probably signifies 9/11 (attack on the homeland causing mass death). The moon's next aspect is opposition to Mars, although it occurs too late to time 9/11.

Instead, if the Moon is held still at 1.29.29 Libra and the Sun is progressed to an exact opposition, the time arrived at is September 20th 2001.