Are Syrian Refugees A Threat To U.S. Security?

Seeker Sources:

4 Things To Know About The Vetting Process For Syrian Refugees
“Their first point of a refugee's contact is with the U.N. High Commission for Refugees. The UNHCR refers people to countries based on whether they have any family members there and where resettlement makes the most sense, say U.S. officials. If that's the U.S., then refugees are vetted by the National Counterterrorism Center, the FBI's Terrorist Screening Center, and the Departments of State, Defense and Homeland Security.” 

Mayor against Syrian Refugees is denounced for noting WWII internment of Japanese Americans
The Los Angeles Times -
“In a letter on official city stationery, Roanoke, Va., Mayor David A. Bowers asked local governments and nonprofit groups to join the more than half of the nation's governors who have said they do not want to accept Syrian refugees into their states, citing security concerns after last week's Paris terrorist attacks that killed at least 129 people. The Obama administration plans to admit about 10,000 Syrian refugees this fiscal year.”