Buffalo -A heavily armed 18-year-old man shot 10 people dead on Saturday at a Buffalo, New York grocery store in a “racially motivated” attack that he live-streamed on camera, authorities said. The gunman, who was wearing body armor and a helmet, was arrested after the massacre, Buffalo Police Commissioner Joseph Gramaglia told a news conference. Gramaglia put the toll at 10 dead and three wounded. Eleven of the victims were African Americans. The gunman shot four people in the parking lot of the Tops supermarket, three of them fatally, then went inside and continued firing, Gramaglia said. Among those killed inside the store was a retired police officer working as an armed security guard. The guard “engaged the suspect, fired multiple shots,” but the gunman shot him, Gramaglia said. He added that when police arrived, the shooter put the gun to his neck, but was talked down and surrendered.Stephen Belongia, special agent in charge of the FBI’s Buffalo field office, told the news conference that the shooting is being investigated as a hate crime. “We are investigating this incident as both a hate crime and a case of racially motivated violent extremism,” Belongia said. Erie County Sheriff John Garcia described the attack as “pure evil.”