Thunderstorms hit the Dallas-Fort Worth area Sunday night into Monday and dropped massive amounts of rain in the span of 18 hours, inundating streets, flooding homes and forcing some drivers to abandon their vehicles in high water. A 60-year-old woman died in Dallas County when her vehicle was swept away.

Over the last two years, universities across Texas and the rest of the country have worked hard to mitigate the spread of COVID-19 on their campuses with virtual classes, masks and increased cleaning of public spaces.

This story includes descriptions of sexual assault and physical violence. This article is co-published with ProPublica, a nonprofit newsroom that investigates abuses of power. Sign up for ProPublica’s Big Story newsletter to receive stories like this one in your inbox as soon as they are published.

The following story, images and video clips contain disturbing material and explicit language. The footage does not include any images of the shooter or gunshot victims. The faces of teachers and students have been blurred out. In some instances, overlapping voices in the videos made exact transcriptions for captions impossible.