I agree, although we all need to see these reports confirmed and verified by multiple witnesses in the next few days. How many typical suicidal people are ambitious enough to go out and acquire high-grade explosives so they can blow themselves up outside a packed football stadium? When a shot in the head would work, why would someone apparently (according to reports) use enough explosives to kill perhaps 20 or more people? This is not a typical suicide, and there are definite indications of a failed terror attack.
The source for the 2nd explosive sounds to good to be fake.
That ends any theory that this person was only out to harm themselves. It just is not even and option.