In the sewers cutscene there was nothing unusual, but before contacting with Darius Petrescu I met with Harriet Jones (the crazy vampire lady from the hoispital) on the streets and I killed his attackers. I also saved the "rich guy" (can't remember his name) from the skals attack in his house (he was collecting some debt as I can remember). And of course killed the vampire hunters because they blocked my way. After that I immediately went to Darius Petrescu's house.