Unknown assailants threw four firebombs at Turkey's consulate in the western Austrian city of Bregenz early Wednesday, causing a small fire and some smoke damage but no injuries, officials said. Investigators were trying to determine the motive behind the attack, which occurred at around 3:30 a.m., police said in a statement. They said only one of the bombs, which contained gasoline, pierced a window of the consulate, and neighbors who heard the explosions alerted firefighters and police. Authorities said the consulate was unguarded at the time of the attack. Investigators were examining security camera footage that showed four young people throwing the firebombs at the building in Bregenz, a city near the border with Germany.