Authorities have not formally named the suspect in the car ramming in the city of Magdeburg that killed at least five people and wounded hundreds, saying only that he is a Saudi doctor who has lived in Germany for nearly two decades and that he acted alone.

The killing of British lawmaker David Amess is once again fueling concern about a government program aimed at preventing at-risk young people from becoming radicalized.

Europe has witnessed many more jihadist attacks on its soil than the United States since 9/11, and analysts say a variety of reasons account for that.