Sweden has added to more counts of attempted murder to the charges against a man suspected of a year-long shooting spree targetting immigrants, court officials said Tuesday.

The 39-year-old man identified by Swedish media as Peter Mangs was arrested last November following a series of race-related shootings in the southern city of Malmoe.

He had already been charged with three murders and 12 counts of attempted murder in Sweden's third largest city, but prosecutors added two counts more counts of attempted murder related to shootings on the night of June 26, 2010.

Media have reported that the accused suffers from a form of autism called Asperges Syndrome.