NY Giants heir arrested for arson after torching motorcycles

The grandson of late New York Giants owner Wellington Mara was busted early Tuesday for allegedly setting motorcycles on fire in his Manhattan neighborhood.

Stephen Mara targeted people making a racket revving their motorcycle engines and setting off car alarms, sources told the N.Y. Post.

The 26 year-old Mara — whose dad, Stephen Sr., infamously pummeled a fellow broker (and Eagles fan) on the floor of the New York Stock Exchange in 2006 — was charged with arson.

Sources said a security guard at the Lexington Avenue Armory at East 26th Street, just around the corner from the suspected firebug’s Gramercy Park apartment, spotted Mara on the street at 2:15 a.m. using a Bic lighter to set fire to the bikes. At least one car also suffered damage.

A local resident said she was awakened by two booms, and looked out her window to see the guard wrestling with Mara — who is a cousin of "The Girl With the Dragon Tattoo" star Rooney Mara. Their fathers are brothers.

Mara’s building super, Frank Galea, said the bikers are often a nuisance in the nightclub-filled neighborhood, noting that a rider was revving his engine so much late one night last week, it set off his carbon-monoxide alarm.

“I went outside, and the guy told me to go f–k myself,” said. Still, Galea added, Mara was acting like a maniac. “For someone to do this, you have to be sick in the head,’’ he said.

Mara was charged with three counts of arson Tuesday night at Manhattan Criminal Court and released on $40,000 bail.

The Giant franchise's scion is an executive for Major League Baseball, a coordinator of on-field operations, a job Mara landed before the 2012 season.

Ironically, his duties include “assisting with disciplinary action,” according to MLB.