Police arrested a total of six people in connection with a deadly explosion of illegal fireworks in a Honolulu neighborhood on New Year’s Eve and confiscated 500 pounds (227 kilograms) of unused fireworks from the scene of the blast, authorities said Thursday. Police arrested two couples on Wednesday and one couple last Friday, said Honolulu police homicide Lt. Deena Thoemmes said. Police expect to arrest more people, she said.The explosion killed three women, one man and a 3-year-old boy and injured about 20 others. The tragedy occurred when a lit bundle of mortar-style aerials tipped over and shot into crates...