

At least 18 people were injured, including three critically, in a stabbing attack at a train station in Germany on Friday, authorities said.
The suspect in the stabbing -- a 39-year-old woman -- has been arrested, police said.
The incident occurred at a train station in Hamburg. A knife was used in the attack, police said.
Police have not publicly identified the suspect. She is believed to have acted alone, according to Hamburg police, who said they are investigating her background. Police believe she may have been in "mental distress."
The attack happened between platforms 13 and 14 - which are accessible via a busy main road - while a train was on one of the platforms.
The suspect began stabbing people waiting for the train, but was stopped by the "rapid intervention" of two people on the platform as well as emergency services, police said.
The victims range in age from 19 to 85. Seven people were slightly injured, seven seriously injured, and four critically injured, police said.
The critically injured - a 24-year-old female, 24-year-old male, 52-year-old female, and an 85-year-old female - were stable as of Saturday.