Update 8:55 p.m.: All three lanes of traffic on I-40 westbound near Papermill Drive have been reopened after an accident.

Previous: Three lanes of traffic on I-40 westbound near Papermill Drive have been closed while Knoxville Police officers investigate a crash.

KPD tweeted they were on scene of a 'serious injury crash' at around 6:48 p.m. Sunday.

Expect delays and use extreme caution.

Serious injury crash being investigated on I-40W near Papermill. Left 3 lanes are blocked. Expect delays and use extreme caution. pic.twitter.com/A5KG8b2HdR

This is a developing story. 10News will update this article as more information becomes available.