Rate the similarity of the following two sentences on a scale from 0 to 5, where 0 is "no meaning overlap" and 5 is "means the same thing"?

Many killed in Japan road tunnel collapse
Many killed in Syrian air strike

Available choices:
a). 0.
b). 1.
c). 2.
d). 3.
e). 4.
f). 5.
b).