English: An El Al Boeing 747-238B at Warsaw Ok...

If chemical weapons have been used in Syria, where did they come from?

My Member of Parliament, George Galloway (Respect, Bradford West) has been widely ridiculed for questioning the source of any chemical weapons used in Syria.
He has been quoted as saying:

“If there has been a use of chemical weapons it was al-Qaeda who used chemical weapons. Who gave al-Qaeda chemical weapons? Here’s my theory: Israel gave them the chemical weapons so that they would use them so that they would bring the international community into the final destruction of Syria.”

Ridiculous, yes?
No, not if you consider the following facts.

From Wikipedia: <>

On 4 October 1992, El Al Flight 1862, a Boeing 747 cargo plane of the state-run Israeli airline El Al, crashed into the Groeneveen and Klein-Kruitberg flats in the Bijlmermeer (colloquially “Bijlmer”) neighbourhood (part of Amsterdam-Zuidoost) of Amsterdam, the Netherlands. For the location in the Bijlmermeer, the crash is known in Dutch as the “Bijlmerramp” (“Bijlmer disaster”). A total of 43 people were killed, including the plane’s crew of three, a non-revenue passenger in a jump seat, and 39 people on the ground.
Many more were injured.
This accident remains the deadliest aviation accident to ever occur in The Netherlands. The disaster was made worse by the fact that the plane exploded and started a large fire after the crash.
In 1997, however, an expert testified in the Israeli Knesset that dangerous products would have been released during combustion of the depleted uranium in the tail of the Boeing 747.
The first studies on the symptoms reported by survivors, performed by the Academisch Medisch Centrum, began in May 1998. The AMC eventually concluded that up to a dozen cases of auto-immune disorders among the survivors could be directly attributed to the crash, and health notices were distributed to doctors throughout the Netherlands requesting that extra attention be paid to symptoms of auto-immune disorder, particularly if the patient had a link with the Bijlmer crash site.
Soon after the disaster it was announced that the El Al Boeing 747 had contained fruit, perfumes, and computer components. Dutch Minister Hanja Maij-Weggen asserted that she was certain that the plane contained no military cargo.
In September 1993, the media reported that the El Al Boeing contained dangerous cargo. Some portion of the cargo proved to be Israeli national defense materials. It was also reported that a third of the cargo had not been physically inspected and that the cargo listings had not been checked.
The survivors’ health complaints following the crash increased the number of questions about the cargo.
In 1998 it was publicly revealed by El-Al spokesman Nachman Klieman that 190 liters of dimethyl methylphosphonate, a CWC schedule 2 chemical which, among many other uses, can be used for the synthesis of Sarin nerve gas, had been included in the cargo. Israel stated that the material was non-toxic, was to have been used to test filters that protect against chemical weapons, and that it had been clearly listed on the cargo manifest in accordance with international regulations. The Dutch foreign ministry confirmed that it had already known about the presence of chemicals on the plane. The shipment was from a U.S. chemical plant to the Israel Institute for Biological Research under a U.S. Department of Commerce license.