There were still no clues as to the backgrounds and the perpetrators, said a police spokeswoman on Friday. An unknown person had thrown on early Thursday morning two bottles of what appears to be flammable liquid on the Café. A disc was broken. A fire broke out in the bar. Investigators are looking for witnesses who were in the Café or in the Morning at 2.15 o'clock in the vicinity of the crime scene. No one was hurt.