At least 18 people were injured, including four 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. A magistrate has ordered the suspect to be placed in a psychiatric institution, Hamburg police told ABC News on Saturday.

Flavio Cobolli has defeated Andrey Rublev 6-2, 6-4 in the final of the Hamburg Open for his second title of the season.