Case of Chinese couple and their two young sons bludgeoned to death in US remains a mystery after a year

A couple originally from China and their two elementary school-age boys were found fatally stabbed and bludgeoned in their modest suburban home just over a year ago.
Investigators since then have run into language barriers, cultural differences and the logistical challenge of a quadruple murder case with tendrils running through Manhattan’s Chinatown and possibly beyond. They’ve looked at an eerily similar family slaying in Mississippi and have reached out across the nation and the globe.

The investigation remains wide open.
“There’s nothing that we’re not looking at,” New York state police Senior Investigator John Camp said recently. “We’re trying to see: Is it human trafficking? Is it money laundering? Is it gang related? We’re basically leaving no leaf unturned.”
Police were called to the small home on a busy commercial road on October 8, 2014. Inside were the bodies of Chen Jin, 39, his wife, Li Hai-yan, 38, and their sons: 10-year-old Anthony and 7-year-old Eddy. Police later said the victims were stabbed and attacked with a hammer.