The Kansas Highway Patrol has joined the search for two girls and their brother who disappeared from their Topeka home.

13-year-old Stephanie Witten, 12-year-old Seth Witten and 10-year-old Michelle Witten were reported missing by their parents just before 11 p.m. Wednesday.

Police said there was no early indication of foul play, and no Amber Alert had been issued by mid-afternoon Thursday.

The search was initially concentrated on the city’s west side, including parks and a shopping mall. Officers expanded the search Thursday morning.

The children’s mother, Kathy Witten, told the newspaper the children were home with her husband while she ran an errand Wednesday night. Witten says her husband later went to a gym, leaving the three children watching TV alone in their basement.