New York City has some of the toughest gun laws in the nation. But Monday’s mass shooting showed their limits, security experts said.

After a deadly shooting at Blackstone’s Midtown office, The Real Deal’s review of holdings found no direct investment in gun-related firms.

Officials say a man carrying a rifle killed four people at a New York City office tower. The shooting took place Monday afternoon at a midtown Manhattan office building that houses finance companies and the NFL headquarters.