Looks like the Daily Mail report about the Saudi's was wrong:
http://dish.andrewsullivan.com/2013/...nd-the-saudis/
Per the Saudi Embassy:
"The Saudi government had no prior information about the Boston bombers. Therefore, it is not true that any information, written or otherwise, was passed to the U.S. Department of Homeland Security (DHS) or any other US agency in this regard. The Saudi government also does not have any record of any application by Tamerlan Tsarnaev for any visa to Saudi Arabia."
Even the original Daily Mail report, which relied on an unnamed Saudi official, hedged its bet:
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If true, the account will produce added pressure on the Homeland Security department and the White House to explain their collective inaction after similar warnings were offered about Tsarnaev by the Russian government. A DHS official denied, however, that the agency received any such warning from Saudi intelligence about Tamerlan Tsarnaev."
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Time will tell I suppose.