Watch "The Big Story Weekend" Saturday and Sunday at 9 p.m. ET!

Saturday

NYC police stepped up security on subways after receiving credible threats to the transit system that serves 4.5 million riders a day. Team FOX is live with the latest.

Then, a parent's worse nightmare comes true: The body of Virginia college student Taylor Behl (search) is found in a shallow grave. We'll talk with Taylor's father, Matt Behl.

And, will new evidence determine the cause of death of Taylor? We'll get insight from former D.C. homicide detective Rod Wheeler, forensic pathologist Dr. Michael Baden and Chief Rodney Monroe of the Richmond Police Department.

Plus, we'll get an update on the Natalee Holloway (search) case from Dave and Robin Holloway, Natalee's father and stepmother.

Sunday

We'll be joined by:

Matt Behl, Taylor Behl's father
Chief Rodney Monroe of the Richmond Police Department
Beth Holloway Twitty, Natalee's mother

Real journalism: fair and balanced. That's why we're No. 1 — FOX News Channel.