6 hours ago Celtics fans gather at Boston City Hall Plaza for watch party Banner 18 goes up in the air Tuesday as the Celtics face the Knicks to open the NBA season. US & World Videos 2:10 Officials say plane's engine caused fire at Logan Airport 5:31 Celtics celebrate Banner 18 as they open NBA season against Knicks 2:30 Hingham high school student, teacher take stand over AI lawsuit 2:10 Hingham parents sue school district over child's AI usage 1:59 Grandmother injured in Stoneham hit-and-run