A letter written to the U.S. Department of Homeland Security in 2012 by officials in Saudi Arabia reportedly warned of accused Boston bomber Tamerlan Tsarnaev's ties to extremism.
The "government to government" letter was very specific and warned that "something was going to happen in a major U.S. city." It named Tamerlan, reported the Daily Mail.
The older of the two brothers investigators accuse of killing three people and injuring more than 200 in a series of bombings at the Boston Marathon on April 15, was denied a visa to enter Saudi Arabia, reports the British paper.
Tsarnaev hoped to make a pilgrimage to Mecca.
Earlier reports indicate Russian agents placed the older suspect under surveillance during a six-month visit to southern Russia last year, then scrambled to find him when he suddenly disappeared after police killed a Canadian jihadist, a security official told the AP.
The security official with the Anti-Extremism Center, a federal agency under Russia's Interior Ministry, confirmed the Russians shared their concerns. He said that Russian agents were watching Tsarnaev, and that they searched for him when he disappeared two days after the July 2012 death of the Canadian man, who had joined the Islamic insurgency in the region. The official spoke only on condition of anonymity because he was not authorized to speak to the news media.
Security officials suspected ties between Tsarnaev and the Canadian -- an ethnic Russian named William Plotnikov -- according to the Novaya Gazeta newspaper, which is known for its independence and investigative reporting and cited an unnamed official with the Anti-Extremism Center, which tracks militants. The newspaper said the men had social networking ties that brought Tsarnaev to the attention of Russian security services for the first time in late 2010.