A suicide attack is an attack in which the attacker or attackers intend to kill others and intend to die in the process (see suicide). In a suicide attack in the strict sense the attacker dies by the attack itself, for example in an explosion or crash caused by the attacker.
The attacker in a suicide attack wants to kill as many people as possible. 
The passage didn't talk about them wanting to kill a lot of people... they may want to kill lots or some may just have a few people they want to kill. There is no way to know. 
( z1 want :ARG0 ( z2 person :ARG0-of ( z3 attack :manner ( z4 suicide ) ) ) :ARG1 ( z5 kill :ARG0 z2 :ARG1 ( z6 person :ARG1-of ( z7 have-quant :ARG2 ( z8 many ) :ARG3 ( z9 equal ) :ARG4 ( z10 possible ) ) ) ) )