Two die while hiking in Western New York

 A family hike in western New York turned tragic yesterday after police say a mother and father died after falling off a cliff and their 4-year-old son was seriously injured.
  
 Authorities say the bodies of 35-year-old Amanda Green and 33-year-old William Green, both of Buffalo, were discovered along with their son in Zoar Valley shortly before 1:00 pm.

 Rescuers found the couple's 7-year-old son walking nearby.
   
According to Erie County Sheriff's spokesman Scott Zylka, the 4-year-old boy was airlifted to a Buffalo hospital, where he is listed in critical condition.

The 7-year-old boy is being evaluated at the hospital.
  
 Authorities believe the two adults and child fell about 200 feet down a steep cliff but are not sure what caused the fall.

Police continue to investigate.