Dozens were charged as authorities suspect human trafficking links.
The suspect allegedly killed his sister, parents and grandmother.
Menhaz Zaman, 23, has been charged with four counts of first-degree murder.
Police said he opened the door for them before they found four people dead inside.
Police say they'll be using all of their resources for the investigation.
The vicim was found safe but the investigation into his bizarre alleged kidnapping continues.
All four suspects wanted in connection with the man's abduction remain at large, police say.
Police are concerned for his safety.
Officers say suspects broke open some glass display cases with sledge hammers.
The suspect is from Markham, Ont.