A routine evening tuition class in Navi Mumbai turned tragic on Thursday after the first-floor slab of a residential building in Koparkhairane collapsed, killing a 14-year-old student and injuring 11 others.

The incident occurred around 5.20 pm at Vidya Bhavan building in Sector 2. A tuition class was underway on the ground floor at the residence of teacher Shamli Chaudhary (53) when a portion of the first-floor slab suddenly gave way and crashed into the room below.