SPRINGFIELD, Ore. - Police plan to step up patrols on east Main Street after a pickup truck hit and killed 3 children and seriously injured their mother Sunday night.

Medics took Cortney Jean Hudson, 26, of Springfield from Main and 54th streets with serious injuries.

She was listed in fair condition Tuesday morning at a local hospital.

The children died at the scene.

Police identified them as 8-year-old John Alexander Day; 5-year-old Mckenzie Mae Hudson; and 4-year-old Tyler James Hudson.

The driver, 68-year-old Larry James La Thorpe of Springfield, stayed on scene and cooperated with police.

The cause of the crash remains under investigation. Police said tests Sunday night ruled out alcohol as a factor.

The deadly crash left the community searching for answers. A memorial has taken shape at the intersection, and a fundraiser for the family had garnered almost $17,000 in pledges as of Tuesday afternoon.

It's also brought renewed attention to pedestrian safety concerns on Springfield's Main Street, which doubles as Oregon Highway 126.

The City of Springfield and the Oregon DOT have made improvements along Main Street to provide better and more numerous crossings.

Officer Brian Antone said he was monitoring traffic for red light violations at 54th and Main prior to the accident. At the time of the accident he was conducting a traffic stop nearby involving a red light violation.

Springfield Police said administrators are planning enhanced patrols to focus on accident causing violations including yellow/red light violations, failure to yield to pedestrians in the crosswalk, and speeding.