Nassau County police found the three victims, ages 35, 34 and 23, bleeding from the face, neck and hands in the street outside La Casa Del Marisco restaurant, 815 Old County Rd. in New Cassel at 2:30 a.m. March 31.
Later that morning, officers arrested Miguel D. Flores, 22, of 726 Anna Ave. and Jose F. Hernandez, 25, of 368 Siegel St.
They were arraigned April 1 in First District Court, Hempstead, charged with assault.
On Saturday, detectives from the special investigation squad arrested brothers -- David A. Hernandez, 17, of 237 Wright St., and Geovany Hernandez, 20, of 379 Cross St.
The brothers are to be arraigned Sunday in First District Court, Hempstead, on charges of attempted murder, assault and weapons possession.
Police said they had no further information on the victims, who were hospitalized in serious condition.