Southbound lanes of I-405 are completely blocked in Bothell due to a crash involving a pickup truck and school bus.

A collision on I-405 south involving a school bus with young soccer players led to traffic backups in Bothell, officials said Wednesday.

A school bus with 20 children and three adults aboard was involved in a crash on southbound I-405 in Bothell at milepost 26 Wednesday afternoon.

Around 1:15 p.m., the state Department of Transportation reported the crash on southbound I-405 just north of Highway 527. The crash, involving the bus, a pickup and a passenger car, initially blocked all lanes. It was unclear what caused the crash.

Bothell Fire says a truck and a school bus crashed into each other on Southbound Interstate 405 near Bothell. It happened just after 1 p.m. The department says 20 children and three adults were onboard,