CALIFORNIA CITY, Calif. — Multiple law enforcement agencies continued their investigation Friday at the California City home where two toddler brothers were reported to go missing from Dec. 21.

According to California City Police Chief Jon Walker, investigators were gathering "statistical" information of the home's perimeter, while using drones from above for imaging. Measurements and photographs were taken from the inside and outside of the home.

Walker said personnel also examined the back gate of the home, which was allegedly left open when the boys disappeared from the backyard, according to adoptive parents.

Authorities were also investigating inside the home, but Walker was unable to disclose what they were working on.

This is one of several times authorities have entered the home to investigate.