After an attack in northern Germany that injured a Ghanaian girl and her father, the police received multiple tips, including information about possible suspects, a police spokesman told dpa on Sunday. The investigation is extensive and will take some time, he added. According to initial police findings, an 8-year-old Ghanaian girl and her 10-year-old sister were attacked by a group of around 20 teenagers and young adults. The 8-year-old and her father, who intervened, were taken to hospital with injuries described as mild. The alleged racist attack has sparked outrage from politicians and led…