An article re a 911 hijacker's relatives involved in espionage has appeared in muslimedia.com, which I've never heard of. The article is without attribution, so at present it would be well to take it with a grain of salt.

Perhaps somebody with time on their hands can try and check it out.

http://muslimedia.com/us-mossad911.htm

Last month the Lebanese army smashed an Israeli spy ring and discovered something that may have far reaching implications for another terrorist operation: the 9/11 attacks on the US. Two brothers, Ali and Youssef al-Jarrah, operating in Jlela region of the Beqaa Valley near the Syrian border, were found in possession of spying equipment while operating under the cover of the National Association for Medical Services and Vocational Training and claiming to run a humanitarian mission. Ali and Youssef al-Jarrah happen to be uncles of Ziad al-Jarrah, one of the hijackers of the 9/11 planes.