According to police, four suspects were apprehended Friday in a horrific series of early-morning subway slashings in Manhattan that left one victim knifed in the eye.

According to law enforcement sources, a 12-inch serrated kitchen knife believed to have been used in the crimes has been found.

According to sources, Soto Burgos, Kenneth Herrera, and Joseph Foster are charged with first-degree robbery in connection with the attacks. According to reports, another person in detention is not being charged and was cooperative in the investigation.

One of the suspects was previously arrested and released on his own recognizance for a similar knifepoint robbery in January, according to police.