Yes it did. Look at the pics.
The steam lines ruptured, destroyed the reactor and pulverized the fuel. This caused plutonium particles to form in the steam rising from the ruins. Later, when the coolant (which was flammable) caught on fire, plutonium particle were part of smoke.
Be careful reading Wikipedia. They are not 100% accurate on this subject.
The fuel used in power plants will not explode. It will become very hot due to loss of coolant, causing other things to happen, but it will not explode.