Gunfire erupts twice in Mount Vernon, 18-year-old shot in chest

Gunfire erupted on the streets of Mount Vernon Tuesday night in two different shootings.
The first shooting happened around 5:42 p.m. in the area of 215 Union Avenue and Third Street.
Multiple law enforcement agencies swarmed the area throughout the night on the ground and by helicopter searching for suspects. No arrests have been made yet.
Sources close to the case tell News 12 one person was shot in the chest. Relatives tell News 12 the victim is a 18-year-old boy who was undergoing surgery last night. He is listed in stable condition at Jacobi Hospital.
About 2 and a half hours later, around 8:10 p.m., more shots were fired just a block away at Union Avenue and Second Street. 
There's no word of anyone being hit by gunfire, but five shell casings were found. The same source close to the case tells News 12 that two suspects ran into a nearby building on Union. They are described as two black males, one wearing a blue hoodie and the other a red hoodie.
The shootings come just one week after four people were shot over on South 8th Avenue while they were attending a vigil.