INDIANAPOLIS, Ind – Just after noon Sunday emergency crews were called to I-465 eastbound near Keystone on the north side for reports of a multiple vehicle serious crash.

Callers were reporting one vehicle was on fire and several people were injured. The crash closed all eastbound lanes of I-465.

Emergency responders found an adult and two children unresponsive, all three were pronounced dead at the scene. They were identified as 29-year-old Alanna Norman Koons and her twin 18 month old daughters June and Ruby Koons of Indianapolis.

Seven other people were transported to area hospitals, one of those patients was described as very critical.

Police say that a semi-tractor trailer ran into the back of a line of cars who were backed-up traffic which was slowed due to construction.

The three that were killed were all in one vehicle and were the first vehicle struck by the semi. Five other vehicles were also struck.

Investigators believe unsafe speed was a factor in this crash. The driver of the semi was 57-year-old Bruce Pollard of Sturgeon Missouri.

Possible charges are pending.