Two persons were injured in dynamite attacks perpetrated this evening against two bank branches in this northwestern, Colombian city.
The bank branches were attacked by an arsonist. 
I'm not sure why it fooled the system. The bank branches were attacked by dynamite, not fire, so it's an incorrect statement. 
( z1 attack :ARG0 ( z2 person :ARG0-of ( z3 arson ) ) :ARG1 ( z4 branch :mod ( z5 bank ) ) )