I really don't think anyone was hurt... or at least not seriously so. I think it was a small explosive meant to send a warning to Julian to stay in line.
I get why people may not like Julian, but what I don't get is why there is so much blame laid solely on his shoulders and not on the ones who are controlling him with his family's safety. He made a BAD choice in aligning himself with FLuke, but things have changed for him and he's made it clear he wants something different. He wants his family. He's FINALLY found something he cares more about than his father's lifestyle, but he's being threatened to do someone else's dirty work. His son has already been shot for trying to get out and now he'll soon learn that Alexis and his family were targeted again because he defied his boss's main man. He can't win and from his past.... he knows what happens to those who turn people in. He's stuck in an AWFUL place and I can only hope that when the smoke clears, those who love him now will truly hear the truth and will forgive him his transgressions.