Investigators said they had yet to establish a motive for the massacre, which was at least the fifth deadly mass shooting in the United States in the past month alone.
Police searched the Johnson City home of the suspected gunman and carried out three computer hard drives, a brown canvas rifle case, a briefcase, a small suitcase and several paper bags yesterday evening.
The attack came just after 10 a.m. at the American Civic Association, an organisation that helps immigrants settle in the US.
One receptionist was killed, while the other, who was shot in the abdomen, pretended to be dead, then crawled under a desk and called authorities.
killed in the classroom
The rest of those killed were shot in the classroom. Four people were critically wounded.
The man believed to have carried out the attack was found dead with a self-inflicted gunshot wound in an office with a satchel containing ammunition slung around his neck.
Police found two handguns, a 9 mm and a .45-calibre, as well as a hunting knife.
The suspected gunman carried ID with the name of 42-year-old Jiverly Voong of nearby Johnson City, New York, but that was believed to be an alias, said a law-enforcement official, speaking on condition of anonymity.
The police chief would not confirm the name of the dead man with the ammunition satchel, saying authorities were still trying to establish with certainty that he was the gunman.
Binghamton, a city of about 47,000, is situated 140 miles (225 kilometres) northwest of New York City. It is not yet known if any Jamaicans seeking citizenship were involved in the incident.
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