Three people have been killed and four seriously injured in a knife attack at the 650th anniversary celebrations of the city of Solingen in western Germany, according to the police. The attacker was still on the run, a police spokeswoman in Dusseldorf said. Police sources said that the case was no longer classified as a rampage, but as an attack. Armed officers are currently at the scene and have cordoned off large areas of the city and set up privacy screens. The incident took place in Fronhof, a marketplace in the city centre where a stage was set up for live music.