The inquiry will be a "watershed" moment in the investigation of child abuse, he said.
Nobody has yet been arrested or interviewed under caution as yet, but the force is "preparing an arrest strategy".
The Commander said: "There's Savile on his own, and that's the vast majority of what we're being told about, there's Savile and others. And it's the others, if they're living, we can look at them. Then there is a third category which is 'others'."
Officers are trying to contact victims as quickly as possible, but for some it is the first time they have spoken about the allegations, Cmder Spindler said.
He told journalists: "We are trying to make contact with as many victims as quickly as we can. We are doing it initially by telephone but some of those telephone contacts are taking up to four hours. This may be the first time that some people have actually spoken in any detail, and we don't underestimate how significant an event it is for them to disclose sexual abuse."