NEW YORK — Police have identified the man arrested Sunday following several subway stabbings since Friday - two of them deadly.

Police say 21-year-old Rigoberto Lopez has been charged with one count of first degree murder, two counts of second degree murder and two counts of attempted murder.

His address is listed as 279 Butler Street in Brooklyn, which is the address of the Red Lion Homeless Shelter.

The four stabbings happened between Friday morning and Saturday morning along the A line. The victims were all believed to be homeless.

The first killing took place just after 11 p.m. on Friday. Police say a man was stabbed to death at the Rockaway Mott Avenue train station in Queens.

Two hours later, police say a 44-year-old woman was found with multiple stab wounds at the at the 207th Street station in Inwood. She later died at the hospital.

A third person was attacked at another station, 181st Street in Manhattan. The victim is said to be in stable condition at an area hospital. 

A fourth attack happened Friday morning, also at 181st Street, involving a 67-year-old who was stabbed and treated at a local hospital.

In response, police immediately deployed an additional 500 officers to the transit system.