Was the triceratops a herbivore carnivore or omnivore?

Velociraptor was a small, carnivorous dinosaur. As such, it would have hunted small prey such as lizards and mammals all the way up to animals as large as Protoceratops. We have proof of Velocraptor hunting Protoceratops because there is a fossil of a Velociraptor and a Protoceratops that died mid combat.