The New York Times is reporting a growing body of evidence has implicated the Chinese military in a large percentage of cyber-attacks against U.S. companies and government agencies. Software companies and newspapers, including The New York Times, have reported breaches of their systems believed to have originated in China. But a new report now links members of the most sophisticated Chinese hacking group — known as Comment Crew — to an area on the outskirts of Shanghai that houses a Chinese military unit. Researchers say one target of the group’s hacks has been a company with remote access to more than 60 percent of North America’s oil and gas pipelines. Under a new directive signed by President Obama, the United States is cracking down on such attacks by sharing information about hacking groups with U.S. Internet providers.