[Daily Mail] Smiling as he meets his family at the airport after arriving from Ankara, Turkey, this is the mastermind of the Boston Marathon bombing as he arrives in America - where he was welcomed as a refugee.Tamerlan Tsarnaev, the second from the left in the photo below, stands taller than his father Anzor, despite being just 16 years old in the picture taken in 2003.
To his right is his younger brother Dzhokhar, nine, who Tamerlan would later radicalize and turn against America, a country which gave them both free housing, an education and a future.
Their sisters Ailina and Bella are also in the photo which was obtained exclusively by DailyMail.com from investigative journalist and author Michele McPhee.
In her book Maximum Harm: The Tsarnaev Nrother, the FBI and the Road to the Marathon Bombing to be published in April, she tells how U.S. authorities believed Anzor Tsarnaev's claimed his life was in danger due to his Chechen heritage and his family was granted political asylum.
McPhee's theory - which she admits she cannot definitively prove - is that Tamerlan was a federal informant and that he turned on America after his citizenship application was rejected.
McPhee writes that Tamerlan expected to be granted citizenship quickly and his anger grew when the process was delayed. He was initially told to come in for his swearing in ceremony in October 2012 but it was put off.
The U.S. Immigration service wrote to Cedarleaf, the FBI terrorism chief in Boston, and asked if he was a 'national security concern'. Cedarleaf replied that there was 'nothing I know of'.
In January 2013 Tamerlan tried again to get his citizenship and had another interview where he was asked about his arrest related to a domestic violence charge.
McPhee says that Tamerlan 'fully expected to walk way' with his citizenship'. Instead. his status was delayed again due to paperwork issues.
Two weeks later, on February 6 2013, an 'angry Tamerlan walked into Phantom Fireworks in Seabrook, New Hampshire, and asked for the "biggest and loudest" pyrotechnics in the story', McPhee writes.
McPhee, an Emmy-award nominated reporter with the ABC News investigative team, writes that he felt 'double crossed' and that he turned on America for failing to keep up its side of the bargain after he worked for them.
