The Middlesex District Attorney’s Office is seeking answers after eight people were injured Sunday morning while riding an MBTA bus in Newton that crashed into a guardrail overlooking the Mass. Pike.

A spokesperson for Middlesex District Attorney Marian Ryan confirmed the investigation, reported The Boston Globe.

UPDATE: 8 Hurt After MBTA Bus Crashes Into Guardrail Over Mass. Pike In Newton http://t.co/N328RLjOMX pic.twitter.com/1cSpzsAEcA — AndreaWBZ (@AndreaWBZ) May 18, 2014

The bus broke through the guardrail and was partially hanging over the Pike.

BREAKING: A first look at that @MBTA bus that broke through a guide rail in Newton from uLocal viewer Simon. #wcvb pic.twitter.com/3tLyr1tal5 — Jim Lokay #WCVB (@LokayWCVB) May 18, 2014

The bus was ultimately secured by the Newton Fire Department to eliminate the threat of the bus falling down onto the Pike, according to State Police. Seven of the injured sustained non-life threatening injuries, according to MBTA Transit Police.

Now: Avoid the Newton Corner area due to bus crash! Traffic is being detoured on Washington St., westerly and exit 17 eastbound is closed. — Newton Police (@newtonpolice) May 18, 2014

MBTA Transit Police is investigating the cause of the crash.