Animal Cruelty: The lion shot dead after escaped at Jos Wildlife Park zoo

A four-year-old lion has been shot dead after it escaped from a zoo in Jos Wildlife Park, central Nigeria. 

This is animal cruelty why they didn't used tranquilizer instead of shooting it dead?

According to Mr John Doy, the Acting General Manager, Plateau Toursim Corporation, the lion escaped “at about 8 a.m. while it was being fed”. Doy said that the lion, which had been caged since 1972,“ slipped through the gate of the cage when it was opened for its routine feeding”.