Livermore police arrested 18-year-old Fernando Cruz-Armento on suspicion of attempted homicide and are looking for 19-year-old Raul Alcala as a "person of interest," who is considered armed and dangerous.
Cruz-Armento was arrested Wednesday in the 700 block of Grace Court.
Alcala is wanted on a felony warrant for a San Leandro robbery that is unrelated to the attempted homicide, according to police.
The attempted homicide occurred at about 1:15 p.m. last Tuesday near the Arroyo Bike Trail west of Holmes Street., police said.
When officers responded to reports of shots fired there they found a 25-year-old man with a bullet wound in his stomach. Police said two men confronted the man and shot him. The two men then fled south across Arroyo Creek.
The victim went to a hospital in critical condition but is now in fair condition, police said.
Officers believe the shooting is an isolated incident.
Anyone with information on the whereabouts of Alcala is being asked to call 911 or the Livermore Police Department at (925) 371-4987.
Anyone with other information about the shooting is being asked to call the Police Department at (925) 371-4777.