The bodies found by hunters in a wooded area last week were identified as 10-year-old Lyric Cook and 8-year-old Elizabeth Collins, Chief Kent Smock of the Evansdale, Iowa, Police Department, confirmed Monday.

The girls’ families have been notified, according to a statement from the Black Hawk County Sheriff’s Office.

A cause of death has not been determined in both cases, police said.

Lyric Cook and Elizabeth Collins were last seen by their grandmother on July 13 when they asked to go for a short bike ride.

Their bikes were found a few miles away near Meyers Lake in Evansdale, about four hours later, along with a purse belonging to Elizabeth.

“Our hearts and prayers go out to the families and friends of those precious girls,” Black Hawk County Sheriff Tony Thompson wrote in a statement posted to the department’s website. “The Black Hawk County Sheriff’s Office pledges vigilance in our pursuit of those responsible and will extend every resource to concluding this case so that justice may prevail.”