Speed was a factor in a two-vehicle collision that killed a 31-year-old woman and her 7-year-old son in Hauula Tuesday night, police say.

The Honolulu Medical Examiner’s Office identified them as Tiana K. Wooten and Xayden Wooten of Hauula.

The deadly collision occurred in the area of 53-834 Kamehameha Highway just before 9:11 p.m.

Police said a white 2009 Honda Civic driven by the woman later identified as Wooten was traveling southbound on Kamehameha Highway when she crossed over the center line and collided with an oncoming gray 2018 Jeep Wrangler.

Police said it was reported the Honda was observed overtaking other vehicles prior to the collision.

Wooten and her son were pronounced dead at the scene.

It was not immediately known whether Wooten was wearing a seatbelt at the time of the collision.

An initial investigation indicated the child was not in a car seat at the time, according to Lt. James Slayter of the Honolulu Police Department’s Traffic Division.

Hawaii state law requires children ages 4 through 7 must be in a child restraint or booster seat.

The occupants of the Jeep — a 35-year-old male driver and 48-year-old female passenger from Utah — were taken to an area hospital in serious condition.

It is unknown at this time whether alcohol or drugs were factors in the collision.

Officers temporarily shut down a section of the highway between Hauula Homestead Road and Puhuli Street to investigate.

This was the seventh and eighth traffic-related fatality on Oahu this year compared to nine at the same time last year.

The investigation is ongoing.