"I am sorry your life ended here." A hand-written note and flowers were attached to a traffic light post in South Philadelphia to honor the victims of a mass shooting this weekend. At least 17 people were killed from June 3 to June 5 in mass shootings, the deadliest weekend of mass shooting gun violence so far this year, according to a USA TODAY analysis. USA TODAY defines a mass shooting as an incident where at least four people are hit with gunfire, even if there are no fatalities. Mass killing refers is an incident in which at least four people are killed. This weekend's bloodshed comes after a spate of gun violence in Buffalo, New York, Uvalde, Texas, and Tulsa, Oklahoma, that has rocked the nation in recent weeks and focused renewed attention on gun laws. Philadelphia police have announced arrest warrants for two people involved in the shooting. One is in custody and police are searching for the other. Click the link in our bio for more details and updates to the Philadelphia shooting.