A mass shooting in the city of Philadelphia on Monday left four people dead, and another four injured. Among the four injured were two children aged 2 and 13, the local police confirmed.The latest mass shooting incident occurred at 20:30 local time on the 5700 block of Warrington Avenue, which is in the Kingsessing neighbourhood of southwest Philadelphia.According to the police, the unnamed shooter, who was allegedly wearing a ballistic vest, was apprehended and taken into custody, and his rifle and handgun have been seized.The six adult victims were transferred to the Penn Presbyterian Medical Center for treatment, and the two minor victims were sent to the Childrens Hospital of Philadelphia, according to the Philadelphia Police spokesperson Jasmine Reilly, as quoted.Philadelphia Mayor Jim Kenney expressed his condolences to the victims, saying, “My heart is with the loved ones and families of everyone involved.”Horrified by the reports of a shooting in Southwest Philadelphia. My heart is with the loved ones and families of everyone involved, and I send my prayers to the victims. https://t.co/URAmvrUQxL— Mayor Jim Kenney (@PhillyMayor) July 4, 2023Second mass shooting ahead of US Independence DayThis is the second mass shooting on the eve of the American Independence Day celebrated on July 4 – also known as Fourth of July.A similar mass shooting in Baltimore in Baltimore on July 2 left two people dead and a further 28 injured.Gun violence has become an endemic problem in the US, and at least 339 mass shootings have taken place in 2023 in the country, according to the Gun Violence archive.