Police say an SUV driven by 30-year-old Cory Openshaw crossed the center line on Route 1A and hit an oncoming car .
Openshaw and 32-year-old Stacy Collins died.
Their three young children were seriously injured.
Their 2-year-old daughter was taken to Massachusetts for surgery and is back at Eastern Maine Medical Center tonight.
Alberta Farthing of Holden was driving the other car. She was injured too.
Tests are being done on the SUV to check for mechanical problems .
Police say they may never know for sure what caused the vehicle to cross into oncoming traffic.