President Donald Trump signed an executive order issuing a temporary ban on people traveling from certain terror-prone countries to America. Critics point out that recent acts of deadly extremist violence have been carried out either by U.S. citizens or by individuals whose families weren't from the nations singled out.
KYRGYZSTAN
Boston Marathon: Three killed, more than 260 injured.
April 2013: Tamerlan and Dhozkar Tsarnaev, U.S. citizens born in Kyrgyzstan, set off two bombs at the 2013 marathon. The ethnic Chechen brothers appear to have self-radicalized long after coming to the U.S. a decade earlier. Authorities say Tamerlan, the older brother, became radicalized in the last few years of his life, including during a six-month trip to Dagestan and Chechnya in 2012.
KUWAIT
Chattanooga recruiting center: Five killed.
July 2015: Kuwait-born U.S. citizen Muhammad Youssef Abdulazeez opens fire at a recruiting center and another U.S. military site a few miles apart in Chattanooga, Tennessee. Investigators said Abdulazeez was a homegrown violent extremist. Relatives said he had a history of mental illness.
PAKISTAN
San Bernardino shooting: 14 killed, 22 injured.
Dec. 2015: Husband and wife Syed Farook and Tashfeen Malik shot and killed 14 people during a company Christmas party in San Bernadino, California. Farook was a U.S. citizen born in the United States of Pakistani immigrants; the other, Tashfeen Malik, was a Pakistani national and conditional U.S. permanent resident who came to the United States on a fiancee visa.
AFGHANISTAN
New York and New Jersey bombings: 31 injured.
September 2016: Ahmad Khan Rahami, an Afghanistan-born U.S. citizen, sets off bombs in New York and New Jersey. There are signs he was radicalized abroad by Islamic extremists, though any ties to IS are tenuous.
SOMALIA
Ohio State knife attack:
11 injured.
November 2016: Abdul Razak Ali Artan, a Somali refugee with permanent U.S. residency, carries out a car and knife attack on fellow students at Ohio State University campus. Artan had spent seven years in a refugee camp in Pakistan before moving to America in 2014. He ranted in social media about U.S. interference in Muslim lands.
SAUDI ARABIA, U.A.E, EGYPT, LEBANON
Sept. 11 terror attacks: 2,996 killed, more than 6,000 injured.
Sept. 11, 2001: Fifteen of the 19 9/11 attackers were originally from Saudi Arabia. The remainder were from United Arab Emiretes, Egypt and Lebanon.