A 31-year-old man has been detained in south-western Germany, accused of stabbing several people in a shelter for asylum seekers. One man was killed and at least five people were injured in the knife attack late on Sunday, police said on Monday. The Nigerian man, also a resident at the accommodation in the small town of Kressbronn on Lake Constance, allegedly knocked on the doors of the rooms on Sunday evening and stabbed whomever opened the doors. A 38-year-old Syrian man died on the spot. Those injured included a 37-year-old man and four women aged between 28 and 34. One man who was seriousl…