Terrorist Rules

Rule 1

if
 Terrorists in town A
 Flight S takeoff from town A
then
 Terrorists on board S

Rule 2

if
 Terrorists on board S
 Flight S landing in town B
then
 Terrorists in town B

Rule 3

if
 Terrorists in town A
then
 Terrorists move on grownd inside dispersing circle R

Rule 4

if
 Terrorists move on grownd inside dispersing circle R
 Dispersing circle cover town A
then
 Terrorists in town A