From KIRO TV:

Seven boys from a Marysville middle school could be charged with a felony in what police say was a sexually motivated assault on a school bus.

Police and school officials haven’t described what actually happened on the school bus To Marysville Middle School where the boys are accused of surrounding a 13-year old girl in a sexually motivated assault.

Though the bus driver was unable to see what happened, a surveillance video onboard the bus recorded the incident.

The school district said four of the boys in the case have been expelled from the district, and three others were suspended until the end of the year.

‘Sexually motivated assault’ seems a curious construction.