Machete-wielding NYC madman who slashed cop spared attempted murder indictment: sources

A grand jury chose not to indict a disturbed Brooklyn man for attempted murder after he attacked three cops with a machete, according to law enforcement sources and union officials.

Jean Blain, 40, is now being held in a psych ward as investigators probe his role in an earlier attack that left a man fearing for his life, sources and the union said.

Blain, who goes by the aliases of “Insane Blain” and “Peter,” according to sources – was cuffed Jan. 22 following the violent caught-on-video confrontation with three cops inside his East Flatbush apartment on New York Avenue near Beverley Road, authorities said.

But during an appearance in Brooklyn Criminal Court this week, the grand jury cut Blain a break because of his mental health issues, sources said.

Blain – who was initially ordered held without bail – could still, however, be indicted from assault and weapons charges, the sources said.

Heart-pounding bodycam footage obtained by The Post Tuesday captures Blain growing increasingly agitated as a sergeant and two officers – who responded to an “emotionally disturbed person” call – plead with him to be “cooperative.”