Authorities are actively searching for four children who were allegedly taken by their biological mother, Mehrangez Sangalieva, in Reseda on Saturday.

The missing children are 1-year-old Rayana Mirova, 2-year-old Maryam Mirova, 5-year-old Zuhal Mirzoda, and 9-year-old Anas Mirova. An Endangered Missing Advisory was issued Tuesday for several counties, including Los Angeles and Riverside, as reported by the California Highway Patrol.

The children were last seen with Sangalieva in the 6600 block of Reseda Boulevard, near Kittridge Street and Reseda Park. Sangalieva, 31, is described as a 5-foot-5-inch-tall woman weighing 155 pounds, with brown hair and brown eyes. She is believed to be traveling with the children in a gray 2011 Toyota Prius, bearing California license plate 6SWK678. According to the Los Angeles Police Department, Sangalieva is subject to a court order prohibiting her from moving the children from their current address while an investigation is ongoing.

The advisory was also activated for Orange, San Bernardino, and San Diego counties.

Authorities urge anyone with information about Sangalieva or the children’s whereabouts to call 911 or the LAPD West Valley Division at 818-374-7611. For non-business hours, contact 877-527-3247. Anonymous tips can be submitted to Crime Stoppers at 800-222-8477 or via lacrimestoppers.org.