birkenfeld with what's believed to be the largest whistle blower award ever. $104 million. citing his exceptional cooperation. >> with $5 billion collected so far, the award to brad is less than two cents on the dollar for every dollar collected by the treasury. >> reporter: after birkenfeld blew the whistle, he was prosecuted for failing to come completely clean about his own actions to help a client avoid taxes. he's now on home confinement, serving the end of a prison sentence. he and others argued the prosecution was unjust. >> this was the largest tax fraud case in the world, and i sacrificed my reputation, my life, my finances, and this is how i get treated? >> reporter: birkenfeld will have to pay taxes on the award and pay his lawyers, who say they now plan to pursue a presidential pardon. lisa myers, nbc news, washington. >>> now we go to syria, where the civil war has triggered a growing humanitarian crisis that we're on the ground to see. more than a quarter million syrians have been forced to flee their own country. most of them to crowded refugee camps in turkey, lebanon, iraq, and most of all in jordan. nbc's ann curry is reporting from there this w