Investigators have focused on a laboratory technician who failed a polygraph test and had defensive wounds on his body, New Haven news organisations reported, citing anonymous police sources.

• 纽黑文新闻组织从一不愿意透露姓名的警察口中得知，调查人员已经将注意力集中到没有通过测谎仪测验并且身上有因防卫而受伤的一实验室技术人员身上。