Metro

12-year-old brutally stabbed after going to smoke pot

Cops busted a 15-year-old Brooklyn boy yesterday in the savage stabbing of his 12-year-old pal, authorities said.

Wayne Henderson was charged with attempted murder for allegedly knifing his young friend, Luis Martinez, multiple times after an argument in Highland Park on Saturday night, according to a spokesperson for Queens DA Richard Brown.

Martinez was in serious but stable condition after the altercation, police said.

“It’s a very serious situation,” said the boy’s sister, Angie, at Jamaica Hospital, where her family was keeping vigil. “He’s not doing well.” By evening, the boy had been moved to Cornell Medical Center, unconscious and requiring a breathing tube, law-enforcement sources said.

Police said Martinez, Henderson and a 14-year-old girl went to the park about 9:30 p.m. to smoke pot, and an argument soon erupted when Henderson reminded his younger friend that he’d gotten in trouble with his family the last time they’d gone there to light up.

Martinez staggered out of the park with multiple stab wounds all over his body, cops said.

The unidentified girl, who is pregnant, was released after questioning.

jamie.schram@nypost.com