http://www.msnbc.msn.com/id/18992200/
A man wielding a 21 inch long knife killed 10 and injured 14 in the Philippines. Never underestimate the deadliness of a knife, especially in skilled hands. Knives are silent, giving the attacker the element of surprise for other victims. Knives never run out of ammo. Knives are deadly in an arc rather than a single vector.
Had there been someone armed with a gun, this sicko would not have killed and injured nearly that many people.