

A man with an AK-47 on a high-speed train between Amsterdam and Paris was subdued on Friday (Aug. 21) by three Americans on holiday. A 26-year-old man of Moroccan origin, reportedly known to French security services, was arrested at the station in the town of Arras, near the border between France and Belgium.

The Americans are Anthony Sadler, a student at Sacramento State University, and his friends, Spencer Stone and Alek Skarlatos, who are members of Air Force and the National Guard, respectively. Here’s what we know about what happened:
France is still reeling from the attacks on Charlie Hebdo and a Jewish grocery store in January and other ”lone wolf” attacks, such as in June when a man set off an explosion at a chemical plant near Lyon and then mounted his boss’s severed head at the plant’s entrance (paywall).